Dogbone Upper Receiver, Machined T marks. The ejection port, or
Dogbone Upper Receiver, Machined T marks. The ejection port, or the place where spent Well I just ordered an upper from DSA, that $38 for stripped M4 feed ramps made it worth it and hopefully it will be marked with a dogbone should I feel the need to clone something. The M4A1 AR15 style Upper Receiver Group is built around a 14. They're well worth the money. 5, 9, 10. *Please note these are manufactured by a mil contractor/facility. Save money. AR15 upper receivers from DD are engineered to Upper Receivers Bison Armory carries forged and billet AR-15 upper receivers for . Mueller Forged Dog Bone AR15 M4 Upper Receiver with Dust Cover & Forward Shop our wide selection of upper receivers and earn rewards with free shipping on eligible orders. wondering if any of them are still in circulation here.