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Posted: 6/14/2013 2:46:43 PM EDT
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Putting together an AR15 using an 80% billet lower.
When the safe selector is installed it does not have crisp and snappy movement from Safe to Semi position. The selector has too much lateral play when in the safe position and is loose. It does have a mushy snap over when reaching the Semi (fire) position. part of which is interference between the safety switch lever and the soft Hogue grip The indent pin when inserted is below the surface of the Lower at the pin hole, but the pointed end only protrudes slightly into the safety switch. It does not seem to have much movement in the pin hole I am using a kit from RRA with Hogue grip. How much should the pointed pin end protrude? How much longitudinal movement should the indent pin have in the hole? Is the machining of the indent and spring hole a problem? Bodiebill |
| Common problem with Hogue grips and I have had it with several Hogue grips I have used. Take a marker and mark the arc the selector makes over the grip. Then take a sharp X-acto razor knife and trim out the area of the of the grip that is making contact with the selector. That has solved the problem in 100% of the selectors and Hogue grips I have had that spongy feel with. Do that before doing anything else and if like mine, after thinning that area of the grip so the selector does not contact it will bring back the snappiness of your selector in all positions. |
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Big bore has you covered on the grip mod, but lets go back to the selector and detent.
Without the grip or any parts installed, install just the selector and the selector detent. Use a small allen wrench, and press up on the bottom of the detent, and see how much selector wiggle you have with pressure up on the detent pin. If the tip of the detent is too narrow/shape to a point, then you can dull the tip of the detent on a piece of sand paper to dull/widen the tip up so it fits into the selector detent more snugly. If the problem is that you can not push the detent pin high enough in the step channel for it for a positive engagement into the selector channel detent's, then the bottom step hole for the selector detent pin needs to be deepened. Again, the step channel for the detent is bottom sized larger then the top of channel, so it's just the bottom step channle that need to be deepened just a touch . Also to point out, the selector pin should not be binding in the channels when inserted, and in fact, if the two channels are sized correctly, and the bottom channel depth correctly, then the tip of the pin should be about 1/3 of the way up the selector when the bottom channel is depth correctly and with the tool removed and the receiver up right, the selector detent should fall right out. So on that note, you can check the upper channel by just running a 1/8" drill bit by hand through it, then on the bottom since the top of the bottom step needs to be squared, then that one takes a 9/64" end mill instead to check the size, or deepen the channel cut. Lastly, the spring channel in the pistol grip can be too deep. So if by hand with pressure up on the selector detent, all is good, but when the grip and spring is installed, the selector is loose/does not hold it position now, then the grip spring channel will need to be shortened. A piece of a Q-tip works good for a band aid, but push comes to shove, something like Two part epoxy works better instead. Lastly, if needed and you want to start checking depths and specs on the receiver, here you go, http://www.ar15.com/content/manuals/lowerBlueprint.pdf FYI, the reason that the selector detent pin channel is stepped cut, and the pin two different sizers, its so you can remove and reinstall the selector in the receiver without having to remove the grip if needed. |
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