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  1. #1
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    Hard to find rail

    Does anybody know where I can find a free float 15in rail to fit a piston system and A2 notch? Nearly impossible I've come to find. Cmmg mod4sa is the intended gun

  2. #2
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    Also I should mention, the muzzle is hard attached so the A2 is unable to be removed.

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  3. #3
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    You'll have to use a 2 piece rail system like a Midwest Industries, or a Troy Delta. Does the CMMG have a carbine length piston system? If so I don't think I've ever seen one that's 15", most are around 12". Do you want a quad or smooth? I'm unfamiliar with the mod2sa, so I'm not sure if these options are compatible. The Midwest Industries is the higher quality of those options.

    http://www.midwayusa.com/product/181...aluminum-black

    http://www.sportsmansguide.com/produ...uard?a=1817641

    http://www.opticsplanet.com/vism-ar1...handguard.html

    https://troyind.com/rail-systems-acc...ils/drop/delta
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  4. #4
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    I'm hoping to hear back from Leapers if their rail will fit a piston but I know Troy doesn't. Looking for a smooth, after hearing all the "cheese grader" comments.

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  5. #5
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    The cheese grater comments is just an internet myth. One guy reads it and spreads it around like a STD. I used quad a lot without gloves and never had a problem with comfort. The biggest difference to me is that if you have small hands and use a thumb over bore grip, the quads are a little bigger in diameter.
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  6. #6
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    I assume that this is the rail your referring to.

    https://www.leapers.com/prod_detail....atus=&mtrack=m

    I have no experience with their products. If your wanting smooth I would consider using a shorter option like the Troy delta. The Troy is a better quality product.
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  7. #7
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    Yeah that's the one. I emailed Troy asking about one of their products that fits an A2 and they said all their rails are for DI gas systems.

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  8. #8
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    Why is the muzzle device pinned and welded? Is it a 14.5" or do you live in a ban state?

    Also, if you've got an A2 front sight base, I don't believe you've got a piston unless you added an aftermarket that doesn't utilize a dedicated gas block. The CMMG piston system utilizes a dedicated gas block that has a picatinny rail on top.

  9. #9
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    As far as I know, the cmmg mod4sa is a 14.5 with a hard mount muzzle to make it legal. A2 piston system carbine

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  10. #10
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    https://youtu.be/cy5iIrQLbiE hard to find much else on this gun

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  11. #11
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    Take the handguards off, I'm pretty sure you'll find a gas tube, not a piston.

    Here's what the piston version looks like
    Name:  CMMG-MOD4-SA-Piston-Ar15-Rifle.jpg
Views: 380
Size:  48.0 KB

  12. #12
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    I hope you're right. Is there anything you can tell from this picture? I don't own the gun yet but that's an aftermarket short rail right?

  13. #13
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    That rifle is DI, not a piston.
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  14. #14
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    Quote Originally Posted by GOST View Post
    The cheese grater comments is just an internet myth. One guy reads it and spreads it around like a STD. I used quad a lot without gloves and never had a problem with comfort. The biggest difference to me is that if you have small hands and use a thumb over bore grip, the quads are a little bigger in diameter.
    I don't know - I've handled some sharp edged KAC rails in the past. Granted, I've never sliced my hand open either.
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  15. #15
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    Quote Originally Posted by Thompson View Post
    I don't know - I've handled some sharp edged KAC rails in the past. Granted, I've never sliced my hand open either.
    Your tender paws is a result of using to much lotion.
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