flash hider position

[Cold/Bore]

Attachment 61626[/QUOTE]

BTW, What is that?

[1168]

Sorry I cannot give anything other than other people’s reviews. I have a covert como, but have yet to try it. The build I bought it for has been on the back burner.

The only thing I could criticize on the Review you cited is that they only used one type of ammo. Using couple different ammunition types would have made it more interesting, and they weren’t exactly using top tier ammunition for the test.

You may be right about either changing barrel or hand guard.

Yeah, that ammo is unflattering, as are the circumstances. I think it was the same stuff Recoil used testing Sandman endcaps for flash. Don’t remember for sure. Anyway, I took the point of using a single, unflattering, ammo as a method of maintaining consistency and bringing out the differences in devices. I think the Covert Comp would probably do just fine for most users, especially if they are unlikely to shoot berm blasting ammo in low light, or they have 16” guns. I do shoot low light somewhat frequently, and used to do so weekly or more, so I tend to pay attention to the differences in flash suppression.

The 10.75” KAC URX4 works great on my 12.3” upper. My 12.5” Grendel upper has a SLR 11.7” upper. It is almost too close for comfort, hence the linear comp taper mount. I highly recommend the URX4, and have 4 weapons built around them.

DocSherm, who has not been posting here much lately, has a few 12.5” guns, and he uses the Larue 11” rails. The pics he has posted show a good barrel to handguard length relationship. I would strongly consider a Larue LAT as an alternative to the URX4.

One of the downsides of the footlong barrels is that there are fewer handguard choices for them. 11-11.5” handguards are optimal. Once you get the formula right, they are fracking awesome.

[Diamondback]

OP, there’s no way around this. If you don’t want to use a linear comp, you need a longer barrel or shorter handguard. Maybe a spacer from ADCO might be enough. Thread adapter/extenders exist, also. I recommend barrels an inch or more longer than the handguard is, nominally. The shortest I’ve had work out right was 3/4” longer barrel than handguard, nominally. And it has a linear comp taper mount.

IIRC a "book spec" GL/SSC is 0.71" nominal difference (12.5" barrel - 11.79" RIS-II). I'm in a similar boat with penciling out an ersatz-'SSC build using an 0.2"-longer Centurion rail and was thinking to compensate with an 0.2" spacer.

[corey4]

Attachment 61626

BTW, What is that?[/QUOTE]

Sico saker maad mount flash hider

[1168]

IIRC a "book spec" GL/SSC is 0.71" nominal difference (12.5" barrel - 11.79" RIS-II). I'm in a similar boat with penciling out an ersatz-'SSC build using an 0.2"-longer Centurion rail and was thinking to compensate with an 0.2" spacer.

FWIW, I just measured a 14.5” with a DD RIS 12”, and the rail measures 12.5” and there is 1.25” from the front of the rail to the barrel shoulder.

[Diamondback]

FWIW, I just measured a 14.5” with a DD RIS 12”, and the rail measures 12.5” and there is 1.25” from the front of the rail to the barrel shoulder.

DD made three different lengths of RIS-II, though... you have the long, Mk 18 has the short and in between is the Unicorn like Stick has. Yours is RIS-II M4A1, NSN 1005-01-57-2624 while I was talking RIS II GL/SSC, NSN 1005-01-548-1381.

[1168]

DD made three different lengths of RIS-II, though... you have the long, Mk 18 has the short and in between is the Unicorn like Stick has. Yours is RIS-II M4A1, NSN 1005-01-57-2624 while I was talking RIS II GL/SSC, NSN 1005-01-548-1381.

I forgot about the shorter RIS.

[Dino11]

I had the same issue with a 10.5 build, I used a 10 inch hand guard and used a YHM flash hider.

https://yhm.net/low-profile-flash-hider.html

[corey4]

I looked at those too. Do you have a pic?

[bamashooter]

You can get a 3.5" (shorty) XM177 flash hider from these guys https://retrorifles.com/moderator-fl...ndo-1963-1974/ . But the hider is modeled off the A1 and is slotted all the way around. Or you could contact this elderly couple up in Michigan (cool peeps) and "he" could likely make you one if you give him the length you're look for. Make sure and tell him you want the wrench flats. Sometimes they don't answer their hard line. The pic shows their cell #. https://northerngunparts.com/



If you order from them, the wife might ask if it's ok to ship the flash hider in a padded envelope because it's approx 1/2 the shipping cost. Love it.