Produce a long descriptive sentence that uses all these words: Sporter Target BARREL_PROFILE A2; A2 BARREL_TWIST 1:7; Sporter Target HAND_GUARDS Ribbed; AR-15 variants, R series models; NAME Sporter Target
With an A2 barrel profile, 1:7 barrel twist and ribbed hand guard, the Sporter Target is an AR-15 variant.