Selector Spring - similar to the takedown and pivot detent springs, but there will only be one of these.Pivot Detent Spring - same as the takedown detent spring, so there are two in a kit.Magazine Catch Spring - this is the largest spring in the kit.Hammer Spring - larger of the two similar springs.Disconnector Spring - similar to bolt-catch spring, but identifiable because one end is wide than the other.Buffer Retainer Spring - second largest spring in the kit.Bolt Catch Spring - easily confused with the disconnector spring disconnector spring is tapered though.With the exception of the roll pins, no part should need to be hammered into place. Because of tight tolerances, some of these parts will be a tight fit. Most parts kits come covered in oil to prevent rust wipe all the excess oil off before assembly. It is a good idea to lay all your parts out on a flat, light-colored surface so that you can verify all your parts are there, and find them easily when you need them. The lower receiver parts kit consists of 30 parts not counting the stock assembly, the receiver, or the pistol grip. Telescoping Stock Wrench - to tighten telescoping stock lock ring.Pivot Pin Installation Tool - handy tool if you build a few lowers.Block of wood - base to support receiver when driving roll pins.#10 Flat-Blade Screwdriver - used for A2 stock screw and some pistol grips.Roll Pin Holders - used to hold and start roll pins.Roll Pin Punches - to drive roll pins (3/32", 1/8", 5/32") these have a small raised projection in the face of the punch to automatically center the punch and prevent the roll pin from collapsing.Specialized tools are available from Brownells, at 51. Minimum requirements include a hammer and punch to drive in a couple of roll pins, a flat-blade screwdriver for A2 stock screw, and either a screwdriver or Allen key for the pistol grip screw. There are a few tools that make it easier to put together these kits, but none of them are necessary. Please send any questions, suggestions, corrections, and helpful tips to.
This guide is is created to help put together an AR-15 lower receiver from a stripped receiver and a lower receiver parts kit.
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