A collapsible PDW style buttstock for AR15 SBRs. At 30oz, it does add weight over a standard configuration carbine; say a 5 position buffer tube, MOE stock, and H1 buffer but with the shorter OAL, imagine the new bag options that become available! Some users are getting AR SBRs in the 22" range with their builds.
Another benefit of the PDW ARC stock -- it utilizes a standard bolt carrier group! Now, you can use any upper in 5.56/300BLK/6.8SPC that is compatible with your lower.
MVB Industries PDW ARC Stock -- $395