Originally Posted by magnum05
I have a bush master carbon model and the receiver does not have ramps but barrel does...I'm getting ready to order yhm receiver and want to make sure if I need the one with out ramps
magnum, look VERY carefully at kytowboater's closeup of the barrel and receiver. His barrel extension has M4 feed ramps (deep cut, not like rifle ramps). And his receiver also has M4 ramps as you'd expect. If your barrel has M4 feed ramps it would be best to get M4 ramps on the new receiver but not absolutely necessary. Now if your barrel has standard rifle ramps, DO NOT get a receiver with M4 ramps, as JonM said.
I guess BM doesn't cut M4 ramps into the composite receiver so who knows what ramps their barrel has.