If your BCM tube is as thick as my Phase 5 tube then the SBM4 shouldn't move, you'll have to find a way to get it on because it fits so tight.
Mine came in the mail on a 98-100 deg day so it had been nice and soft from sitting in the mail box. As soon as i felt how hot it was I slipped it over my tube and aligned it before it cooled down.
I have mine set a few inches back from the end plate with no spacer and it hasn't budged while shooting or sitting in the safe. Because it's made of rubber you can kind of see where the tube is in the butt stock because it's a little wider now on the outside of the stock, still doesn't interfere with the charging handle.
IMHO the SBM4 looks the best, not fat and bulky like the other SB braces and if it "accidentally" hits your shoulder while firing it's comfortable. I've read the the shockwave digs into your collarbone?
Also the end of the SBM4 is open, so a spacer would fall out.
IMG_8705 by hd_rolling, on Flickr
Last edited by hdrolling; 07-21-17 at 08:22.
DDM4V11 PRO, SSA-E, Vortex viper 6.5x20-44mm
BCM 16 KMR-A, SSA, EO Tech EXPS 3-0, G-33 magnifier
S&W M&P Sport II, BCM PNT, Aimpoint PRO
BCM 9" 300 BLK upper/KAC lower/DD BCG/ BCM PNT/ Aimpoint T1
Noveske upper/lower/handguard, 20" 6.5 Grendel Bartlein Barrel, SSA-E,Vortex viper GEN II PST 5x25-50mm
16" BCA .223 Wylde "budget rifle", SPARC AR
Retired Army Airborne Infantry
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