JP Enterprises AR-15 Enhanced Ignition Reliability Spring Kit with Red Hammer Spring

Manufactured by JP Enterprises
Manufactured by JP Enterprises
42 Reviews

In Stock

Standard orders will ship out same day if ordered by 3:30pm CST. FFL orders will ship within 5 business days or less as long as we have the information for the transfer destination.



Precision-calibrated springs produce a consistent pull on a stock JP M15 rifle trigger, while preserving ignition reliability with U.S.-manufactured ammunition. This trigger and hammer spring kit produces a 3.5 to 4 lb. trigger pull. These springs are designed to be optimal with JP Enterprises fire control groups but can also be used with properly prepared (instructions included) mil-spec trigger/hammer components to produce a 4- to 5-lb. pull with a smooth “roll off feel and good control. Install this spring kit in your AR-15 trigger group to ensure reliable primer strikes on hard military surplus ammo.

  • 3.5 - 4 lb trigger pull on JP M15 AR trigger
  • 4 - 5 lb trigger pull on Mil-Spec trigger
  • Reliably ignites ammo with hard primers
  • Instructions included
  • Includes trigger spring, hammer spring, and disconnector spring
  • Suggested Use: Hobby / Sporting

This easy-to-install upgrade is an excellent way to improve the reliability, trigger pull weight, and trigger feel, on your AR-15 without spending a large amount of money. 

Equipment should not be a limiting factor. Whether a professional or a first-time shooter, move up to the best. JP Enterprises creates innovative new ideas that fill the needs of serious and recreational shooters. Their policy is simple: if you are not happy, they are not happy.
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BrandJP Enterprises
TypeTrigger Spring Kit

WARNING: This Product can expose you to chemicals which is known to state of California to cause Cancer and Reproductive Harm. For more information, see

Ratings & Reviews

42 reviews

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so far so good


This jp 3.5t spring i get just under 5lbs which is not really bad compare to my colt. I went target shooting yesterday and i used 3 different ammos the winchester, american eagle and tula. All of them went bang without single problem. I recommend this spring to anyone

Good Investment


Added these to my ACT ALG trigger and they made it even more enjoyable to shoot. Makes for a good combination. I will be adding more of these to some of my other FCGs. Shipping was very prompt as usual.

Recent Purchase


Another outstanding experience dealing with PA! I will continue to use your company as long as ya'll continue to offer such outstanding service .

JP Enterprises AR-15 Enhanced ignition reliability


Excellent upgrade for stock trigger. Polished up the parts and installed the springs. Smoother pull. Plus super fast shipping .

fast ship


Have not installed as yet. Primary gets your items to you Quick, Quick! In this age of if'y this or if'y that, I am telling you, Go with Primary Arms!



Huge step up from milspec

So far so good


I changed out the JP Reduced Power Spring kit (JPS3.5) to the JP Reliability Enhanced Spring kit (JPS3.5T) because I experienced a lot of light primer strikes with the JPS3.5 version with my AR15. Now that I replaced the spring kit with the JPS3.5T, I haven't experienced any light primer strikes with the recent change, thus far. The trigger feels real smooth. I would recommend this product.

Good product


I installed these springs with my ALG Defense ACT trigger kit. The result is a very crisp 4.5 pound trigger pull. I haven't had any light primer strikes as of yet. For the money you can't go wrong with these springs.

Great Springs


I love them, helped reduce pull weight as promised.Super fast shipping.Look forward to a long relationship with Primary Arms

Primary Arms is the bees knees


I recently ordered a bunch of parts to finish off my first AR build. Primary Arms sent me all of my products within 3 or 4 days of ordering. I even asked for some stickers to "decorate" my gun case and they sent a variety to help lol. Definitely recommend to everyone I know. Awesome company.