Quick view Rock Island Rock Island TM22LA20 TM22 Full Size 22 LR 10+1 20" Black Anodized Barrel, Black Anodized Picatinny Rail Aluminum Receiver $290.15 The rock island armory tm22 is 7075 aircraft grade aluminum from end to end.Compatibility with ar type grip, commercial buffer tube adapter, top rail, and forend that takes most aftermarket accessories, this rifle is built for all ages, all types of... Compare Add to Cart