Strike Industries Enhanced AR-15 Builders Lower Parts Kit

Strike Industries Enhanced AR-15 Builders Lower Parts Kit

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$60.95 $58.95




  • 1x Bolt Catch Spring - easily confused with the disconnector spring; disconnector spring is tapered though.
  • 1x Buffer Retainer Spring - second largest coil type spring in the kit.
  • 1x Disconnector Spring – slightly larger than bolt-catch spring, identifiable because one end is a little bit wide than the other.
  • 1x Hammer Spring - largest of all the springs.
  • 1x Magazine Catch Spring - this is the largest coil spring in the kit.
  • 1x Pivot Detent Spring - same as the takedown detent spring, so there are two in a kit.
  • 1x Selector Spring - similar to the takedown and pivot detent springs, but larger diameter; there will only be one of these.
  • 2x Takedown Detent Spring - same as the pivot detent spring, so there are two in a kit.
  • 1x Trigger Spring - the smaller of the two largest springs.

Pins and Parts:

  • 1x Strike Industries Enhanced Bolt Catch - features improved grip surfaces and angles
  • 1x Strike Industries Enhanced Magazine Catch
  • 1x Strike Industries Enhanced Magazine Catch Button - features improved grip surface
  • 1x Strike Industries Enhanced Pivot Pin - longer of the two large pins.
  • 1x Strike Industries Enhanced Takedown Pin - smaller of the two large pins.
  • 1x Strike Industries Selector Lever - 2 included in package
  • 1x Strike Industries Selector End Plate
  • 1x Strike Industries 60-90° 3-in-1 Selector Shaft - with screws
  • 1x Bolt Catch Plunger – mushroom shaped pin
  • 1x Bolt Catch Roll Pin - smaller of the two roll pins.
  • 1x Hammer Pin – solid pin with machined grooves; can be inserted from either side.
  • 1x Pivot Detent - same as takedown detent; both sides usually rounded or semi-conical.
  • 1x Selector Detent - one end is flat, the other pointed/semi-conical.
  • 1x Takedown Detent - same as pivot detent; both sides usually rounded.
  • 1x Trigger Pin - same as hammer pin; can be inserted from either side.
  • 1x Buffer Retainerlarge hollow barrel with small pin protruding from the top

This Strike Industries Enhanced Lower Receiver Parts Kit does not come with the trigger, hammer, disconnector, pistol grip assembly, and trigger Guard.


  • AR-15 lower receiver

*Magazine Catch thread is metric and will not work with California Compliant Bullet Button or other third party mag release buttons.


Whether you start out to do a major upgrade on an existing rifle or plan on building that perfect system from the ground up, the sheer number of small parts that need to be added to the purchase list can be overwhelming. Of course, the performance of each tiny spring and pin is also important to the functionality of the rifle as a whole. For many armorers, the best way to handle the upgrade of an AR-15 lower is to use a pre-packaged lower parts kit like one of the Strike Industries AR Build kits.

If you’re upgrading a lower receiver, there’s no need to wade through a sea of inferior parts. A Strike Industries Enhanced AR-15 Builder’s Lower Parts Kit includes high-quality versions of everything on that laundry list of small but important lower parts and leaves you the freedom to use the large trigger parts that fit your shooting style. No guilt over wasting money on duplicate parts, and no compromise with a trigger you didn’t want.

The Strike Industries Enhanced Lower Kit features many of the same reliable parts as Strike’s other AR build kits, but offers some premium upgrades for those of us who want the whipped cream and cherry on top. The improved gripping surfaces on Strike’s Enhanced Bolt Catch and Magazine Catch Button are just two of those little extras included in this Enhanced Lower Parts Kit. Upgraded Pivot and Takedown Pins, as well as Strike Industries best selector parts, will push the performance of your upgraded rifle beyond the realm of simple expectations. If you want to build your dream rifle, use the Strike Industries Enhanced AR-15 Builder’s Lower Parts Kit.

Write a Review

9 Reviews

  • Strike industries Enhanced Lower parts kit

    Posted by Robert on 8th Jun 2021

    I cannot comment on trigger components because I used drop in triggers on my guns. The rest of the parts work fine with the exception of the "safety selector" of which I tried 2 from separate 2 of these lower parts kits I purchased. The detent would not drop down in with either one I tried and the fit to even get the safety in was very tight. After giving up I grabbed a safety selector from a random LPK I had and that safety when in smooth as could be and no issues getting the same detent pin in that one. My other two builds did not use Strike industries safety's and also had no issues. Don't get me wrong because there are plenty of Strike industries products I love but this one not so much especially if I did not have another safety selector lying around.

  • Best lower parts kit

    Posted by Firerader on 31st Dec 2020

    I've purchased cheaper parts kits that work just fine. I've also purchased custom components and added them to my cheap parts kits.
    This kit has everything in a single bag to not only built the lower but to make it look and feel like a very custom build. I've used Strike Industry parts on a number of builds and I'm always very happy with the finished product. When people ask me about my builds or how to build a lower I always recommend this exact built kit and I also recommend Wing Tactical to source it.
    Bottom line; you can't beat this build kit if you plan on adding your own trigger. You cannot beat the price and quality of this kit hands down, no question.

  • Great product

    Posted by Jason Shipp on 17th Nov 2020

    I must say this kit is very nice to have. There is only one downfall is the mag release feels very wobbly and loose. But besides that the entire product is it good kit to buy.

  • Can’t go wrong

    Posted by Joshua Douglass on 2nd Jun 2020

    One of the best lower parts kits you can purchase for the price

  • Strike Industries enhanced lower kit

    Posted by Joel Spain on 2nd May 2019

    This was my first build. Glad I picked this kit went together very well looks and works great. I will buy this one again on my next build.

  • Nice machining and It makes installation much easier

    Posted by bo tao on 2nd Jan 2019

    SI make some of the best AR products on the market. Engineering and machining are superb. I have been using this kit on most of my builds. The take-down detentes with small polite pin holds the spring in place during the install was a great design. The safety select switches could be a little rough on the hand (without wearing gloves) if one needs to constantly switch them on-and-off. The trigger spring set is a bit heavy, around 6.5 lb pull.

  • Better than milspec

    Posted by Russell on 27th Jan 2018

    Tight fit and nice finish. Matched my billet lower perfectly

  • great product and looks graet

    Posted by John in GA on 3rd Aug 2017

    well made, great finish, very functional and adds that look that most ar's do not have. I will use again on my next build.

  • If you're unsure, don't be...

    Posted by Mpoakes on 29th Jun 2017

    I did two recent AR builds and was looking for a parts kit that was reliable, affordable and better than the basic kit I've used before. This kit met all of my needs. It is nice having the extended take down pins and bolt release and knowing that Strike Industries is a reputable company. I haven't had the chance to do anything more than function check my weapons since they were built, but I don't foresee any issues.

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