Great retrofit - Pro Mag AR-15/M16 Bayonet Lug Accessory Rail PM216

I had an older M4 with zero rail space and needed just enough room to attach a light. This did the trick exactly as advertised, turning the otherwise useless bayonet lug into a short 1913 rail perfect for my SureFire. It is solid, all metal construction, and the set screws attach it very securely—no wiggles or rattles. You do need to remove your forward sling swivel to attach the rail, but it comes with its own sling attachment slots on either side (as seen in product picture).

All in all a great product, and I would not hesitate to recommend it.