AR 15 Lower Receiver Parts Kit

If you’re looking for an AR 15 lower receiver parts kit, check out the ones we have below. Under these kits we have some of the items that can be found in kits very easily today.

The AR-15, one of the most popular and in-demand rifles in the U.S, is among the most preferred firearms with prolific usage amongst U.S. government agencies and private users. Due to its high demand, the AR-15 lower receiver parts kit is available in different configurations and abundance in markets. The parts kit consists of about 30 parts not counting the basic stock assembly, the receiver, or the pistol grip. U.S. firearms laws consider the lower receiver of the AR-15 a firearm and subject to purchasing regulations.

With numerous combinations and configurations out there, the list of parts in the AR-15 lower receiver parts kit varies based on design. Most variants of the AR-15 lower receiver parts kit contain the below tools:

  1. Roll Pin Punches – to drive roll pins (3/32″, 1/8″, 5/32″)
  2. Roll Pin Holders – used to hold and start roll pins make it more convenient
  3. Hammer – used to drive the roll pins
  4. #10 Flat-Blade Screwdriver – used for A2 stock screw and some pistol grips
  5. Block of wood – base to support receiver when driving roll pins
  6. Pivot Pin Installation Tool – handy tool if you build a few lowers
  7. Telescoping Stock Wrench – to tighten telescoping stock lock ring

 

SPRINGS

  1. Bolt Catch Spring – easily confused with the disconnector spring which is tapered
  2. Buffer Retainer Spring – second largest spring in the kit
  3. Disconnector Spring – similar to bolt-catch spring, but identifiable as one end is wider than the other
  4. Hammer Spring – larger of the two similar springs
  5. Magazine Catch Spring – this is the largest spring in the kit
  6. Pivot Detent Spring – same as the takedown detent spring (2 per kit)
  7. Selector Spring – similar to the takedown and pivot detent springs, but only one piece
  8. Takedown Detent Spring – same as the pivot detent spring, so there are two in a kit
  9. Trigger Spring – the smaller of the two similar springs

 

PINS

  1. Bolt Catch Buffer
  2. Bolt Catch Roll Pin – smaller of the two roll pins
  3. Hammer Pin – same as trigger pin; can be inserted from either side
  4. Pivot Detent – same as takedown detent; both sides usually rounded
  5. Pivot Pin – larger of the two large pins
  6. Selector Detent – one end is flat, the other pointed
  7. Takedown Detent – same as pivot detent; both sides usually rounded
  8. Takedown Pin – smaller of the two large pins
  9. Trigger Guard Roll Pin – larger of the two roll pins
  10. Trigger Pin – same as hammer pin; can be inserted from either side
  11. Bolt Catch
  12. Buffer Retainer
  13. Disconnector
  14. Hammer – will have a J-pin already installed
  15. Magazine Catch
  16. Magazine Catch Button – some are plastic, some metal
  17. Pistol Grip Lock Washer
  18. Pistol Grip Screw – some are Allen-head, some use a slotted pan-head screw
  19. Selector
  20. Trigger
  21. Trigger Guard – metal or plastic, with a detent installed on its front end

Most versions of the AR-15 lower receiver parts kit come covered in oil to prevent corrosion, so before assembly, excess oil should be carefully wiped off. Some parts fit very tightly, so due care must be ensured including minimal hammering into place.

Depending on brand and quality, prices vary with different variants. A complete AR-15 lower receiver parts kit could cost between $55 and $75. The China versions could range anywhere upwards of $35.

Hey guys, I'm Specialist Paul Bauer. I'm an active duty member of the U.S. Airborne Infantry and have served almost a year in Afghanistan. While I was there, I developed a strong passion for AR-15's and it stayed with me to this day.
I've built this site to help share my passion of AR-15 building with you! If you want to reach out to me personally, the best way is to e-mail me at ar15supplystore@gmail.com