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first 'from scratch' build


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I did have a little trouble getting the bolt release catch to work well.  After I tapped in the roll pin it seemed tight, the spring wouldn't reset it, but I dropped some Break Free in there and it loosened up, now it snaps back into place.  If you're having trouble with the selector being loose, I wonder if their springs are up to snuff...

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Rob suggested the channel might be to deep on selector but if no one else is having a problem <dontknow> .That was my first lower build.Went through the parts process of elimination on what went where.About the only springs that looked similar in lenght were takedown/pivot and selector.Use same lenght springs for takedown/pivot and other for selector.I got BAD selectors to replace just wondering for myself if I fukedup or what. <dontknow>

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I assembled an ar15 lower acouple weeks ago and used a longer selector spring to make the selector work properly. If it is too tight you could cut a couple of coils off of the standard lenght selector spring. Or if it rotating freely find a longer spring at a hardware store and use that one.

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Nice!  The addiction begins!!




Ha, yeah, I've got another PSA lpk with the QMS trigger.  I'll get another lower at the next show and start a different build then.


Now, on to uppers.  I'd really like to put one together from pieces, just to say I did, and for the knowledge.

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  • 3 weeks later...

I recently bought a RRA LPK at a really good price and will compliment it with a Geiselle SSA-E down the road, using the extra parts as backups. Tom recommended the Armalite LPK with match trigger awhile ago and I think I'll be giving that a shot on my SBR build next year. I've never bought a PSA LPK but have mostly heard good things.

Edited by jrtmasp
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