Cart (Our custom gas plug has been designed to help you safely shoot commercial ammunition hassle free in your M1 Garand. Our gas plug has a tuned port that delays the operating rod for several microseconds and lowers the peak gas cylinder pressure by over 30%! Unlike a vented gas plug, ours requires no adjustments and is ready to use right away. The gas plug can be installed using a standard 1/4 socket driver!
Our ported gas plug does NOT vent gas like a vented gas plug. The secret is the hollowed out area in the base of the plug which increases the initial volume of the gas cylinder. By increasing the volume, the peak pressures are reduced without the need to vent the gas.
Customer QuestionsQ: Will the ported gas plug work with normal M2 Ball Ammunition? A: Absolutely! The ported gas plug will work with all M2 ball ammunition types made.
Q: Will the gas plug work with low pressure loads? A: This is a harder question to answer without knowing the load being used. If there is enough gas pressure to cycle the rifle with a normal gas plug, then the ported plug should operate correctly. If the load being tested is marginal, the ported plug may not cycle the rifle reliably.
Q: The product mentions the potential for increased accuracy. Can you explain that? A: Accuracy in it's most basic form is the ability of the rifle to remain unchanged from shot to shot. The M1 has several factors inherent in its design that can cause the rifle to move or shift slightly from shot to shot. Forces acting on the barrel can change between shots. If this occurs then the accuracy potential is degraded. The ported gas plug does two things. The first is to delay motion of the op-rod for a few microseconds. (delays the forces applied to gas piston). This helps keep the system more static until the bullet has left the barrel. The second is to reduce how hard the op-rod is forced rearward. This reduces the natural flexing and bending the operating rod experiences and helps the rifle return to the same state between shots. Recall that accuracy potential is a result of the sum of all the factors acting on the rifle. The gas plug will not make a 5 MOA rifle a 1 MOA rifle.
Q: Will the gas plug work with a gas system that is worn out? A: The gas plug is designed to work with an M1 Rifle that has a gas system that is in spec. That is to say, not worn beyond the normal reject levels. That would be a gas piston with a diameter between 0.5250" and 0.5260" and a gas cylinder that is between 0.5280" and 0.5320". The operating rod spring should also be in spec and not worn excessively and the rifle properly lubricated.
Q: Can I use the ported gas plug on a Tanker or a M1 Garand with a short barrel? A: The ported gas plug is designed to work with a standard length M1 Garand Rifle. A Tanker or short barreled M1 moves the gas port closer to the chamber and results in port pressures that are many times higher then a M1 Garand was ever designed to operate with. The ported design is not suitable for use in this application.
Q: Can I use a bayonet with this gas plug? A: The ported gas plug is NOT designed to accept a bayonet with a lug that inserts into the gas plug. The lugs on the bayonet are larger in diameter then the 1/4" cutout on the gas plug and will not allow the bayonet to be fully seated.
Q: What causes an Op-Rod to get bent? A: There are three factors that can result in damage to the Op-Rod. The first is high pressure in the gas cylinder. The second is binding of the Op-Rod, and the third is poor lubrication. If any two of the these three conditions is present then damage is possible. If the op-rod is binding then the operating rod will flex and bend when cycling until the bind is overcome. This causes the operating rod to flex and damage is possible. Our ported gas plug reduces the peak pressures in the gas cylinder, which in turn reduces the peak forces acting on the operating rod. Always check your M1 for binding by performing the [Tilt Test].
Q: Will the gas plug work with low pressure loads? A: This is a harder question to answer without knowing the load being used. If there is enough gas pressure to cycle the rifle with a normal gas plug, then the ported plug should operate correctly. If the load being tested is marginal, the ported plug may not cycle the rifle reliably.
Q: The product mentions the potential for increased accuracy. Can you explain that? A: Accuracy in it's most basic form is the ability of the rifle to remain unchanged from shot to shot. The M1 has several factors inherent in its design that can cause the rifle to move or shift slightly from shot to shot. Forces acting on the barrel can change between shots. If this occurs then the accuracy potential is degraded. The ported gas plug does two things. The first is to delay motion of the op-rod for a few microseconds. (delays the forces applied to gas piston). This helps keep the system more static until the bullet has left the barrel. The second is to reduce how hard the op-rod is forced rearward. This reduces the natural flexing and bending the operating rod experiences and helps the rifle return to the same state between shots. Recall that accuracy potential is a result of the sum of all the factors acting on the rifle. The gas plug will not make a 5 MOA rifle a 1 MOA rifle.
Q: Will the gas plug work with a gas system that is worn out? A: The gas plug is designed to work with an M1 Rifle that has a gas system that is in spec. That is to say, not worn beyond the normal reject levels. That would be a gas piston with a diameter between 0.5250" and 0.5260" and a gas cylinder that is between 0.5280" and 0.5320". The operating rod spring should also be in spec and not worn excessively and the rifle properly lubricated.
Q: Can I use the ported gas plug on a Tanker or a M1 Garand with a short barrel? A: The ported gas plug is designed to work with a standard length M1 Garand Rifle. A Tanker or short barreled M1 moves the gas port closer to the chamber and results in port pressures that are many times higher then a M1 Garand was ever designed to operate with. The ported design is not suitable for use in this application.
Q: Can I use a bayonet with this gas plug? A: The ported gas plug is NOT designed to accept a bayonet with a lug that inserts into the gas plug. The lugs on the bayonet are larger in diameter then the 1/4" cutout on the gas plug and will not allow the bayonet to be fully seated.
Q: What causes an Op-Rod to get bent? A: There are three factors that can result in damage to the Op-Rod. The first is high pressure in the gas cylinder. The second is binding of the Op-Rod, and the third is poor lubrication. If any two of the these three conditions is present then damage is possible. If the op-rod is binding then the operating rod will flex and bend when cycling until the bind is overcome. This causes the operating rod to flex and damage is possible. Our ported gas plug reduces the peak pressures in the gas cylinder, which in turn reduces the peak forces acting on the operating rod. Always check your M1 for binding by performing the [Tilt Test].
The effect of the ported gas plug design is shown below.
(Click image for full view)
Custom Made in the USA
Customer Reviews
- functions flawlessly Review by Josh
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Bought this to run Remington core-lokt. Functioned exactly ad advertised, zero malfunctions. I would very much recommend it. The only thing that would make it better would be if it were compatible with the M3A1 combination tool. (Posted on 12/13/2018)Quality - Great product Review by Infantry327
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I installed the new gas plug the day before shooting and was using Remington 150gr core lok and my M1 performed flawlessly. After much research and reading it was not a hard decision to give my rifle a little extra protection and flexibility in ammo use. (Posted on 10/7/2018)Quality - Ported Gas Plug Review by Patrick
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Bought two ported gas plugs. One for regular Garand 30-06 and one for my tanker .308.Quality
Both work great. I was having a problem with the tanker ejecting the spent rounds into my shoulder. Changed op spring and hammer spring with no difference. Bought and installed
The ported gas plug and it now ejects at About three o'clock. For me, it works in a tanker.
Thanks. (Posted on 8/23/2017) - Worked great in my .308 Garand. Review by Ozzy
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Worked like a charm in my .308 (7.62x51) NM Garand. Tightened up my groupings at 200 yd using PPU FMJ BT 145gr 7.62x51 M80 ammo. Can't wait to try it in a match and with other ammo. (Posted on 5/13/2017)Quality - Great idea great product Review by Gregg
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Had mine over a year now. Great product . I've had my rifle more than 25 year's now when they were not so popular. But I always kept it clean and well greased. I used to buy bag's of 100 surplus round's for $20.00 good old days. Was in the service 28 years so iQuality
didn't do much recreational shooting after 9/11 we were busy retired in 2008. Got back into shooting and got this computer and learned about certain ammo found this plug and nu worries. I still try to stay within the boundaries. But it's good to know I can shoot reloads to modern ammo with out issues well worth the money (Posted on 5/6/2017) - so far so good Review by David
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So i've tried twice now to share my videos on here of my trials using this, so far, amazing product. I am a "youtuber" or at least trying to be one. I have attempted to put on video my ammo testing with this product. As my summary says: so far, so good. I haven't noticed any damage on my rifle so far and it seems to function fine. For any that are curious my youtube page name is Gunlover82. Search for the ammo testing. So far this is a great product and appears to work as advertised. Buy one and try for yourself! (Posted on 5/26/2016)Quality - Hot Loads Eject to the Side or Front Now Review by KERRY
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After reviewing the excellently presented research offered on this site (I know enough physics to be wary), pontificating and just being skeptical....oh, and reading these reviews...I purchased one.Quality
I was motivated by my stash of HV ammo that I had for my 1917 Eddystone, and was repelled at the prices for Garand-specific ammo.
After a day at the range shooting a hodgepodge of Remington, Winchester and Fiocchi hunting cartridges (up to 3Kfps MV), I am SO pleased.
The casings ejected to my side (two feet) or in front of my station. I also experienced a lesser recoil. I am a skinny kid of 64 years old, so it is good.
I shot well for an old guy at 100yds (6" group of three, five inches above the bulls eye). Then I had to go. Da!M women.
Great product. Arrived early. Cannot say how much this site and product helped me! (Posted on 5/24/2016) - Must have! Review by Chris
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I am an engineer, and wondered about the effectiveness of this item. Three things have confirmed it:Quality
1) I had to bump up the charge 0.2 g (of H4895) in my handloads to get the gun to consistently cycle, indicating less pressure on the op rod than with the vintage plug. Now, the bolt cycles back just far enough to consistently catch the next round and ping the clip. Perfect! Felt recoil is more of a push than a pop.
2) Better yet (as I believe someone else has said), before, my brass was beside me, in front of me, and behind me. Now, it is consistently behind me in a 4' radius. This make it much easier to find brass.
3) Gun ('44 SA) was grouping about 2" at 50 yds. Now, I am shooting - no lie - about 3/4" at 50 yds. Why? I think it is because the shot cycle is much more consistent, and I settle back into the next shot more easily.
This is well worth the money. (Posted on 5/5/2016) - No-brainer...just get one Review by Will
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I bought a '43 SA Garand a couple years ago with a new criterion barrel and match stock; what a weapon. There is something about the marriage of parkerized steel and dark wood that gets me. She can easily pop melons at 100 yards, and is a great conversation piece to boot. Being an obsessive internet researcher, I learned that advances in powder technology have allowed for a lot more bang to be packed in the substantial 30-06 case than was possible back in WWII. If you are content only shooting surplus ball ammo and you have an infinite, cheap supply, then this plug is a waste of 45 bucks, the USGI one will work fine. If you are like most M1 owners, you want to be able to go to any sporting goods store on a whim and pick up a box of commercial ammo to shoot. I don't know about you guys, but I did not feel comfortable shooting commercial ammo with my GI plug fixed. After running through a stash of M2 ball I bought at a show, I came upon the Garand Gear gas plug as a solution to my ammo woes. Compared with an adjustable plug the Garand Gear Ported Plug seemed too good to be true. How could it allow the weapon to cycle with 150 grain surplus ammo and hot Hornady Superformace loads that have 20% more muzzle energy(3178 vs 2655 lbf)? Then I read the description which explained the science behind the ported plug, and I saw the light. Hats off to Garand Gear for the graphs and data, I do not think I would have bought this product otherwise. Thorough product testing is so valuable I can't even imagine how many operating rods they mangled for our benefit to get those control numbers. What sealed the deal were the positive customer reviews on this site. Shipping was fast and installation is as simple as unscrewing the old plug and screwing the new one in place. I have had the Ported Gas Plug for a little over a year now, and the M1 has happily eaten every type of ammo I have fed it, with no cycling issues concerning enough that I can remember. The menu included a healthy diet of 180g Remington Core-Lokt soft points along with various other loads. The most important factor is that it turns any M1 into a fun, carefree shooter. These guns are pieces of history as well as beautifully crafted machines, and they are meant to be enjoyed. Being able to throw any ammo into the clips and plink has allowed me to enjoy my Garand more thoroughly. For example I was able to shoot a box of hot commercial ammo that my buddy gave me at some pumpkins. Overall, I am extremely grateful that Garand Gear invented this thing because it allows Garand owners to shoot more, period. BUY THIS! (Posted on 12/15/2015)Quality - No More Worries With Commercial Ammo Review by Shane
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This product is an absolute must-have for any M1 Garand. I ordered it shortly after I purchased a 1942 Winchester at a local gun shop last December. I've shot over 500 rounds with various bullet weights from various manufacturers and the rifle has functioned flawlessly with no damage to the op-rod. I don't plan on ever using the stock gas plug. (Posted on 10/25/2015)Quality
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