When I first saw the SBM4 I loved it, until I bought one and mounted it. It felt fine and worked just looked big and bulky to me. I added a PDW brace and know it feels right, I'd spend the extra and get the PDW if that's what you really want. I've seen the SB's for $220 but I get a military discount at most online vendors. I found this Maxim with JP spring for $350 shipped and decided to spend the extra.
IMG_9343 by hd_rolling, on Flickr
IMG_9345 by hd_rolling, on Flickr
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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