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Thread: Suppressed Lightweight SBRs

  1. #11
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    Video is of these 3 rifles in the order below. All ammo was LC XM193 and XM855.

    1. 14.5 ELW BCM barreled upper. H buffer and standard carbine spring. With Surefire Socom Mini.

    No issues suppressed or unsuppressed. 4 oclock brass without a can. And between 2-3 with. Very smooth. I had about a inch and a half drop at 50 yards with the can on. Using a 4moa dot T1 so take that for what its worth. The mini is louder then the others if you can tell in the video. I was thinking that the mini on 14.5 would be close to the same as the 11.5 with the RC. But the 14.5 with mini is louder.

    2. 11.5 LW BCM barreled upper with SLR gas Block. Tubbs flat wire and H Buffer, Surefire Socom 556 RC

    So this is where it gets a little more interesting. My goal today was to figure out the gas settings and buffer weights and spring combo with this rifle. Un-suppressed with the Tubbs flat wire and H buffer would run but short stroke on setting 8. Had to have it on 9 to lock back on empty mags. Would still run and cycle the next round. Brass would not hit deflector. 5 oclock position. On setting 6, with a H2 and carbine spring, I would have the same issue. So setting 9 with the Tubbs H1 set up and setting 7 with H2 carbine spring ran just fine. Brass at 4 oclock. Running the Socom 556 RC on there put the brass between 2 and 3 oclock. Lock back on every empty mag. I put a H2 on one of my SBR lowers and the Tubbs and H1 in another. I would do 10 round strings of fire and then swap lowers and go back and forth. Ive come to conclude that the tubbs has More "twang" and is harsher then the H2 carbine spring set up. I did this on all 4 of the SBRs I had out there. And the H2 carbine set up had faster follow up shots on target with less movement. H2 just felt a lot more solid. End of that debate for me. I put over 400 rounds through the rifles just going back and forth. Shot about 800 rounds total today. Another note. I did not notice any real difference between the Socom Rc and the Mini on blowback. Probably because of the adjustable gas block. But the sound is louder on the mini. Obvously. I didnt shoot them right after one another in a video. Sorry about that. With this rifle, I saw one about one inch to 1 and 1/4 at 50 yards drop from the can attached. Roughly.

    3. 12.5 BCM Standard upper. H2 and standard Carbine Spring. M4-2000.

    No issues suppressed or unsuppressed. 4 oclock without a can. 2-3 oclock with. With the Tubbs and H1 I tried in this rifle it had the most muzzle dip and harsh feeling out of them all. Swapped back the H2 and carbine spring and felt so much better. I also swapped in a H3 buffer with carbine spring and it would still run perfectly without a can. With the can on, it would spit em out right a 3 oclock. You can feel the weight difference in the recoil thump in your shoulder on the H3. I went back to the H2 and called it good. With this 12.5 barrel and the m4-2000 I saw roughly about an 1inch of drop with the can on at 50 yards. Again, 4moa T1. Take it for what its worth.

    4. 11.5 BCM BFH upper. Not seen in Video. But in picture. H2 and Carbine spring. Waiting on KAC CQB QDC.

    It ran well, as always. Tried the H1 with Tubbs and found same results. Kept the H2 and Carbine and shot about 120 rounds. No issues.


    Attachment 27944

    Last edited by Jwknutson17; 08-24-14 at 18:22.

  2. #12
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    Good info, thanks! Did you happen to record the POI shift on the BCM BFH 11.5" as compared to the LW 11.5"? Assuming you shot it suppressed. I'm in the same boat as the OP, doing a supressed 11.5" build and can't decide between LW and heavier barrel profile.
    Director of Business Development - Unity Tactical, LLC - Design and Validation for the tactical community.
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  3. #13
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    I have shot it with the M4-2000 a while back but never tested POI drop. I have a KAC mams brake on the BFH barrel now. I assumed the KAC can would have showed up by now, but hasn't. I was going to do a comparison of the Socom Mini and the KAC QDC. Hope in the next 2 weeks ill have it. Didnt feel like taking off the muzzle brake thats rocksett on there..
    Last edited by Jwknutson17; 08-13-14 at 14:24.

  4. #14
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    Quote Originally Posted by Jwknutson17 View Post
    I have shot it with the M4-2000 a while back but never tested POI drop. I have a KAC mams brake on the BFH barrel now. I assumed the KAC can would have showed up by now, but hasn't. I was going to do a comparison of the Socom Mini and the KAC QDC. Hope in the next 2 weeks ill have it. Didnt feel like taking off the muzzle brake thats rocksett on there..
    Are you planning on getting a QDC CQB or full-size?

    I'd like to pick up a CQB for my 14.5" SR-15.

  5. #15
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    Quote Originally Posted by scooter22 View Post
    Are you planning on getting a QDC CQB or full-size?

    I'd like to pick up a CQB for my 14.5" SR-15.
    Its the smaller CQB can. Its been 10 weeks on a form 3 now. I figured they would be faster then that for dealer transfers right now.. But soon as it hits the mailbox, Ill be out putting it through its paces. If it ever shows up. I don't have a 14.5 set up with MAMS to test it out on. But will be able to get a pretty good idea comparing it to the Surefire and shooting the surefire mini on my 14.5. I know the KAC is lighter, so I cant see any reason why it wouldn't be a perfect setup on a 14.5. The plan is to do low light fire when it comes in. If the KAC mams brakes weren't so darn expensive, I would pick up another and throw it on my other 14.5 upper. Do a side by side 14.5 KAC CQB and Surefire Socom Mini. Anyone want to send me one to test out.. Ill send it back

  6. #16
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    I'm running a Government profile 11.5 with a KMR and a can. I look at the extra material on the barrel as more ability to absorb heat.
    "You people have too much time on your hands." - scottryan

  7. #17
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    Quote Originally Posted by markm View Post
    I look at the extra material on the barrel as more ability to absorb heat.
    Agreed. The more material the longer it takes to heat up/longer it takes to cool down. Lighter heats up faster but cools faster. Just depends what the application and how much that matters to each person vs weight of barrel. 3 30 round mag dumps in a row with a can, and I guarantee a LW barrel glows red. Ask me how I know And its highly not recommended. Takes about 30 minutes before you can touch anything. But I do like watching bugs sizzle
    Last edited by Jwknutson17; 08-19-14 at 11:38.

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