Our primary business is PS90 SBR conversions and PS90 Ultra low optics mounts. We also manufacture the widest line of suppressor thread adapters available in the USA along with HK style 3 lug and threaded SBR length barrels for AR-15 9mm firearms and our own line of firearms sound suppressors. We are also Aimpoint High volume dealers so e-mail for pricing on any Aimpoint products you may be interested in.