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  #1  
Old 11-30-2019, 02:59 PM
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BlackKnight BlackKnight is offline
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Originally Posted by FfNJGTFO View Post

Do you favor "matched" upper/lowers (i.e. that can "swivel open" or does it matter?
I don’t think it matters. I have a BCM upper on a POF lower and they fit really well and I can swivel it open.
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Old 11-30-2019, 03:53 PM
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I don’t think it matters. I have a BCM upper on a POF lower and they fit really well and I can swivel it open.


It really doesn’t unless you are build a precision target gun. Then the tighter tolerances of a matched upper/lower will have some benefits.


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Old 12-01-2019, 12:26 AM
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Aero receivers, and a few other manufacturers as well, have a threaded hole that allows a plastic tipped set screw to press against the bottom surface of the upper receiver's rear boss. This can be used to eliminate the play between the upper and lower, while still allowing the pin to move without tools.

If you aren't a fan of installing roll pins, Aero's M4E1 receivers use threaded pins for the bolt catch and forward assist retention. This, with the integrated trigger guard, greatly simplifies the assembly process. I don't know of any other forged receivers that have this feature.
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Old 12-01-2019, 08:44 AM
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...... If you aren't a fan of installing roll pins ......
...... and they are known to be a pita at times, especially on the trigger guard.
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Old 12-01-2019, 10:18 AM
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Originally Posted by Grizzman View Post
Aero receivers, and a few other manufacturers as well, have a threaded hole that allows a plastic tipped set screw to press against the bottom surface of the upper receiver's rear boss. This can be used to eliminate the play between the upper and lower, while still allowing the pin to move without tools.

If you aren't a fan of installing roll pins, Aero's M4E1 receivers use threaded pins for the bolt catch and forward assist retention. This, with the integrated trigger guard, greatly simplifies the assembly process. I don't know of any other forged receivers that have this feature.
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...... and they are known to be a pita at times, especially on the trigger guard.

I've had some experience with roll pins from the LE6920 build I did. It's something I need to learn how to do, so I may as well start with this build. I have punches etc. and will get any others I need.
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Old 12-01-2019, 06:13 PM
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Get roll pin punches. Regular punches bang them up and spread them out.
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Old 12-01-2019, 11:13 PM
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Get roll pin punches ......
^^^ This !!
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COTEP #762

A gun is a tool, no better or no worse than any other tool: an axe, a shovel or anything. A gun is as good or as bad as the man using it. Remember that.

And shepherds we shall be, for Thee, my Lord, for Thee.
Power hath descended forth from Thy hand, that our feet may swiftly carry out Thy command.
So we shall flow a river forth to Thee, and teeming with souls shall it ever be.
In nomine Patris, et Filii, et Spiritus Sancti.
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