adjustrable gas plugs for M1 Garand

I have used the M1 rifle for almost 30 years, with the standard gas cylinder plug and have never experienced any function issues with standard ball ammunition or equivalent commercial ammunition. I've used my rifles for hunting and target shooting. Many shooters fail to properly tighten the gas plug, leading to cycling issues.

Are you having reliability issues with reloaded ammunition?

If you have to have one, look up Fulton Armory, in Savage, Maryland USA. I have visited their operation and purchased parts from them before. They list a gas cylinder plug with adjustable jets for $39.95 US.

You'll need a postal box in the States to receive it. Like most firearms businesses, they won't ship internationally anymore.
 
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There are two types, one made by Schuster and one by McCann. I don't have firsthand knowledge of the Schuster, but I have the McCann on one of my M1s and like it very much. Basically, it is a gas cylinder lock screw that has been bored out and tapped for an allen screw. The allen screws have a small diameter hole drilled through the center. There are 5 allen screws with each set, each with a progressively larger diameter holes or 'jets'. The jets bleed off/vent gas from the gas cylinder allowing you to use heavier bullets and or slower burning powders than recommended for the M1 gas system. It also allows you to use commercial ammo that may be too 'hot' for the M1 gas system. You can switch back to the normal gas cylinder lock screw at any time. There are no permanent modifications to your M1. I have heard that they are easier to clean and maintain than the Schuster sytem, but I don't know that for a fact.
They're a little pricey, $40 here in the states plus a hefty $10.50 shipping. A good machinist could probably make one for less.
You can get them from McCann Industries, www.mccannindustries.com You should look for them on the 'accesory' page.
Hope this helps.
 
They don’t reduce recoil? They slow the op rod down thus slowing the action down a bit. Helps to prevent the brass from becoming damaged. As mentioed above, they just screw in as a reg gas plug. Here's a pict.

100000402.jpg


You can buy the part from Brownell's p/n 100-000-402 $40 USD made by “MC CANN INDUSTRIES”.

Regards

Peter
 
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Good to know they are shippable. I have been looking at these on the Brownell's website and may get one. BTW there is also a model where you don't have to exchange screws, there is just on adjustable valve/screw.
 
That would be the Schuster plug.
Adjusted by an Allen key , the further out , the more of a vent.
I wouldn't know where you can find a Schuster offhand , I got mine from a fellow CGN'r.
Either way you choose , a vent plug is a very good investment for any Garand owner who shoots.
I'd like to take my rifle out for a deer hunt and with that ammo , a ventable plug will be needed.
I never felt any difference in recoil , even with the vent wide open , where I was cycling the rifle by hand. Your still releasing the same energy and pressure .
 
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These gizmos are like trying to gild the lily.Approx 6 million Garands were made and none were furnished with this kind of device in military service.If you stick to milspec ammo or handload with the correct propellants and bullet weights to replicate milspec standards everything works fine.If you wish to use non-milspec ammo, or go to a caliber other than .30-06 or 7.62,then these gas relief devices can be used to prevent damage to key components,especially the operating rod.The good news is that milspec propellants,such as IMR4895/4064, and bullets in the milspec range of 150 to 175 gr offer the best accuracy and reliability in the Garand.
 
All true, but there are some people who DO want to use heavier bullets, odball hunting loads, or even just dial it down so that is will only just eject and function, to save wear and tear and make brass easier to pick up.

Probably not necessary for most users, but still usefull for some people anyway.
 
Just got a Garand, and it came with the McCann plug. I picked up some American Eagle 150g FMJ to try out the rifle with. Advertised velocity on the box was 2900fps, which is about 150fps faster than what the Hornady manual lists for max velocity with 150/155g loads. I don't want to beat up my op-rod, so if I fire these loads with the largest aperature installed in the gasplug, do you think this will bleed off enough gas to make these OK to shoot ? Or am I worrying needlessly ?
 
I think you are worrying needlessly. It is heavier than standard bullets that are the supposed to be the problem. On the other hand, venting some of the gas will reduce wear and certainly won't hurt.
 
I could not get the Schuster, but Brownells will still ship the Mccann out (I got one of those), I would pick the ammo that is easiest for you to get and most commonly available and set it up with that make of ammo, it works fine for me, also Fulton's does not want our business either, last time I checked. . . :wave:
 
Gus Fisher, former USMC armourer who works on Garands at the National Match contests at Camp Perry, told me that the regular American Eagle 150 FMJ is ok for the M1, though a bit hot. American Eagle also now makes a load specifically for the M1, which P&D in Edmonton is trying to bring in. I don't trust the Remington or Winchester 150 FMJ, however.
 
albertacowboy said:
Gus Fisher, former USMC armourer who works on Garands at the National Match contests at Camp Perry, told me that the regular American Eagle 150 FMJ is ok for the M1, though a bit hot. American Eagle also now makes a load specifically for the M1, which P&D in Edmonton is trying to bring in. I don't trust the Remington or Winchester 150 FMJ, however.
Click to expand...

Why dont you trust the REM/WIN stuff ??? It's quality factory ammo.
 
The issue with commercial .30-06 ammo in the Garand relates to the propellant generating the correct gas port pressure to cycle the action without damage to the op rod.Commercial ammo is generally loaded to yield a higher muzzle velocity with slower burning propellants.MILSPEC propellant for the Garand is on the faster burning range(IMR 4895/4064) which produces the correct pressure pulse at the gas port.The other caution is bullet weight.I shoot my rifles a lot and,apart from a stash of US and Cdn MILSURP ammo,I use handloads exclusively with IMR 4895 and 4064 and bullets weighing 150-175gr.As mentioned in my earlier post,these handloads yield very satisfactory accuracy as well as reliability.
 
Yes, I'm aware of that...that's why I installed a McCann adjustable gas system (smallest jet) and I use Remington UMC 150 gr. FMJ-BT (MC) $22.50/box...it's the best ball ammo I can get my hands on, and my M1 Garand LOVES IT :)
 
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