Here ya go
http://www.pkfirearms.com/content/1/20/56/76
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Here ya go
http://www.pkfirearms.com/content/1/20/56/76
When did Bushmaster start adding M4 feedramps to their uppers? Is this some type of build gun that PK is doing? Does anyone know if RR HP/MPI inspects their BCG's?
Mine has what Id cal 'extended' ramps, but IIRC Bushmaster calls them M4 ramps
Bushmaster has offered their "M2" extended ramp on select-select fire, gov/LE, and special runs for years. More recently, more have been seen in normal production.
Per RR, they don't HP/MPI their bolts or barrels. I don't recall if they batch test or test the material, though.
The Bushy I bought 2 months ago has ramps on the reciever. The woman at the local gun shop said she had never seen m4 feed ramps of any kind nor had she heard of them after years of building AR's!