Sons of Liberty Gunworks SOLGW M4-L89 SBR, SOLGW’s ultimate fighting AR-15 short barrel rifle. The SOLGW L89 AR-15 Short Barrel Rifle is available in 5.56 or 300 blackout, the 5.56 comes in both a 11.5 inch or 12.5 inch barrel and the 300 Blackout comes with a short 8.5 inch barrel. All SOLGW L89 SBR’s are outfitted with a Vltor A5 buffer system for reduced recoil and has a SOLGW Liberty Precision L2s trigger with a ultra crisp pull. Every L89 SBR by Sons Of Liberty Gun Works comes with a ultra ridged Drivelock M-LOK handguard, creating the perfect platform any M-LOK accessory or optic you want to put on it.