Allen Engineering Allen Engineering Custom AEM5 / AEM22 Collar for Colt M4 barrel MSRP: Was: Now: $56.00
Allen Engineering Allen Engineering Thread Protector for the AEM "Ops Inc #12" brake mount MSRP: Was: Now: $39.95
Allen Engineering Allen Engineering AEM-5 "Ops Inc." #12 Mk12 SPR collar and adapter (short) MSRP: Was: Now: $185.95
