British Special Forces 3rd Gen Integrated Upper Receiver’s from Colt Canada

[khw]

Both of these are awesome, NW fellas

[DStocker]

Both of these are awesome, NW fellas

Thanks man, I cant wait to have it fully finished.

[Dude in G.P.]

Why are you using 55gr through a 1 in 7 twist barrel? Shot some SS109. I have been shooting SS109 and to really make it a laser beam, use BH Mk262.

Holy heck, at 50m any ammo should do at least 2moa. Geez, if it makes ya feel better, I used Mk262 Mod 1 as well with much the same results.
Like I said, need to go back and try again as one range day is not definitive results. As a comparison, my DD MK18 upper has no issues with 55gr Norc

[DStocker]

Well, initial trials had groups of 5-6" at 50m with the ATRS adapter, without FH and adapter it was printing 1.5" groups. Norc 55gr 5.56. So more testing is required to know if i had a bad day or something else was funky.

I have to wait a bit to go to the range next, but from the rounds I put down last week I didn't seem to have a spread like you are experiencing. That being said when I installed my adapter I noticed what looked like a gap between the end of the barrel and the inside of the adapter but that could have been my eyes playing tricks on me.

[Dude in G.P.]

Thanks man, I cant wait to have it fully finished.

Agree!

[r34skyline]

Why are you using 55gr through a 1 in 7 twist barrel? Shot some SS109. I have been shooting SS109 and to really make it a laser beam, use BH Mk262.

I do with a fair degree of success. Norc ammo on the other hand... well their 7.62x39 seems decent but my experience with their 556 has been erratic.

But dude in gp if it was grouping better before then grouping significantly worse... are you keyholing any of the hits? Might be something is contacting the projectile that shouldn't be.

[Mr_Mike]

after getting my 10.5 i suddenly feel the urge to get the 15.7 (and i haven't even finished building the 10.5)

[Aiden26]

after getting my 10.5 i suddenly feel the urge to get the 15.7 (and i haven't even finished building the 10.5)

I got the 15.7. Really neat! A tad heavy due to the heavy barrel profile but I like the fact it has perfect barrel harmonics. And the 10.5 is actually just 10".

[Aiden26]

What is the ATRS adapter? Every time I google it I just find a pic rail adapter.

[Mr_Mike]

I got the 15.7. Really neat! A tad heavy due to the heavy barrel profile but I like the fact it has perfect barrel harmonics. And the 10.5 is actually just 10".

I know it's a 10 but they call it a 10.5 so i'll stick with that.

Do you have the SAS 15.7 or the danish 15.7?

ATRS adapter is just a cosmetic barrel extension to make it 11.6 (for CANSOFCOM clone builders)