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| Gunsmithing & How To Pro, Amateur & WECSOG and Tutorials, Guides & OLL Build Instructions |
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#1
02-03-2015, 4:38 PM
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"Less than 80%" lower
I'm looking to start my first 80% build. I bought a couple 80% lowers about a year and a half ago, with the intention of someday completing them. Well, the time has come that I'm looking to get the project going. I bought the lowers not knowing half of what I know now about AR's (which still isn't a whole hell of a lot, but it's enough that I have a grasp on things). Anyway, I pulled the lowers out of storage and inspected them, and discovered an obstacle (not sure how big yet, which is why I'm here). They're more like 75% lowers. Compared to a friend's 80% lower he got from Tactical Machining, mine is missing a few things.
1. No hole for the pivot pin detent/spring. 2. No hole for the bolt catch plunger/spring. 3. No hole for the grip screw. How big of a deal is this, and what are my options? I don't see the pivot pin and bolt catch holes being something too difficult for me to tackle, if I knew the proper schematics, but the threaded hole for the grip screw sounds like it could definitely be challenging. Given that there are 80% lowers on the market that have these features already prepared, are there any shops/smiths that would take care of these issues to bring them UP to 80%? If nothing else, at least the grip screw hole? And if not, does anybody know where I can find a guide to do this part myself? I'm hoping the answer isn't "you're screwed", because although this is money I spent a long time ago, I'd hate for it to be money down the drain in the end. Thank you guys.
__________________
"The power under the Constitution will always be in the people. It is entrusted for certain defined purposes, and for a certain limited period, to representatives of their own choosing; and whenever it is executed contrary to their interest, or not agreeable to their wishes, their servants can and undoubtedly will be recalled." --George Washington 
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#2
02-03-2015, 4:44 PM
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If you're confident enough to do #'s 1 & 2, then you shouldn't have any issue doing the grip screw hole. If you're using a drill press, just tilt your table to the appropriate angle and go. If you're using a mill, then set up an angle plate or use 1-2-3 blocks.
__________________
NRA Life Member No posts of mine on Calguns are to be construed as legal advice, which can only be given by a lawyer. 
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#4
02-03-2015, 5:08 PM
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PM Kerry above, Top notch dude, top notch work!
This comes from first hand experience.
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#5
02-03-2015, 6:14 PM
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Aww the old days. I have done quite a few like that, and some with quite a bit more that needed to be done.
This is the best jig for doing just about everything that the new jigs don't cover. http://www.cncguns.com/forum/index.php?topic=6.0 Here are instructions for doing some of those things. http://www.cncguns.com/projects/ar15...utorial-1.html By the time you get that jig and the extra tools you need you may be better off getting in on TM's lower sale. http://www.tacticalmachining.com/80-...-receiver.html
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#6
02-03-2015, 7:37 PM
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Quote:
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#7
02-08-2015, 2:03 PM
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Ill ask here because its a similar issue but does Tactical Machining ever send out 80s that don't have the bolt catch detent hole not drilled?
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Im a genuine E-thug, because talking s**t in person is dangerous.
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