After running across a great deal on a barrel & handguard I needed an upper to assemble these parts into.
Apond advise from a fellow AR rimfire addict I purchased this upper no dust door/forward assist/ shell deflector from RIGHT TO BEAR .
The fit to my RRA lower seems to mate up well. The anodizing could be a bit better,(little thin under the ejection port) but for what I paid I'm ok with this.
Next thing I noticed was the threads were flat on one side of the upper. As a machinist this screams "out of spec" & do not use!
You can see this in these pictures, so I grabbed my micrometer & calipers & thread wires . I gauged the threads, I check the bore,I checked for out of round and best I find the raw forgeing was slightly out of spec.
A barrel nut spun on nicely. Everything gauged good.
I finally noticed a slight bur on the face of the receiver where the barrel will register. This is fairly common in my experience. I will find my lapping tool (I made the tool) and lap the face "true" before finally assemble.
As I did a quick mock up,all parts seem to fit correctly.
At $59.99 plus $11 shipping (usps flat rate priority mail) I feel this well worth the money for your nest PCC or rimfire build
Aaron
Apond advise from a fellow AR rimfire addict I purchased this upper no dust door/forward assist/ shell deflector from RIGHT TO BEAR .
The fit to my RRA lower seems to mate up well. The anodizing could be a bit better,(little thin under the ejection port) but for what I paid I'm ok with this.
Next thing I noticed was the threads were flat on one side of the upper. As a machinist this screams "out of spec" & do not use!
You can see this in these pictures, so I grabbed my micrometer & calipers & thread wires . I gauged the threads, I check the bore,I checked for out of round and best I find the raw forgeing was slightly out of spec.
A barrel nut spun on nicely. Everything gauged good.
I finally noticed a slight bur on the face of the receiver where the barrel will register. This is fairly common in my experience. I will find my lapping tool (I made the tool) and lap the face "true" before finally assemble.
As I did a quick mock up,all parts seem to fit correctly.
At $59.99 plus $11 shipping (usps flat rate priority mail) I feel this well worth the money for your nest PCC or rimfire build
Aaron
