The Original buy of M4 carbines had a set carrying manage and rear sight much like the M16A2. The flattop higher receiver with the Picatinny rail was launched While using the M4A1 variant in 1994, and all subsequent orders for all M4 variants would have a flattop upper receiver. Variants https://danteuhpiz.blogpostie.com/45732349/examine-this-report-on-knights-armament-quad-rail