Quoted: fyi i put a jp spring kit in my bushmaster this weekend. This is just the srpings that lower the factory trigger group down to apx. 4-5 pounds. Shooting pmc 55 grain ball i had two failure to fire in 80 rounds. I thought this would be a cheap stop gap until i could afford a real trigger upgrade, but i don't think i could really recommend it.
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Just out of curiousity, did you use the "tactical" JPS40 spring kit?
On the web site, it notes that uses of ar10/SR25 rifles, as well as those using ar15s for "tactical" or cold weather applications should use this version of the spring kit, which includes a stronger hammer spring to alleviate any ignition woes, caused by tough primers and so forth. I would not exactly call just shooting milsurp ammo a "tactical application" however, it seems to me that spring kit would be the right choice for one using milsurp or similar ammo.
here is the quote from their site:
"The “Poor Mans” trigger job:
Spending $140 or more for trigger parts on every M15 rifle you may own may not be realistic. If you can’t quite pop for our complete trigger kit, or have too many rifles and can’t justify expensive triggers in all of them, then this may be for you. You can achieve a significant improvement over stock parts by using a set of our custom trigger/hammer springs and the Rydol sear compound. With proper sear and hammer notch preparation, a livable 4.5 to 5.0 smooth trigger in a rifle with standard trigger components is possible. It will not have the extremely short engagement/over travel feel like the JP trigger, but you will have a smooth “roll-off” feel that will give usable trigger control. The spring kit includes trigger, hammer and disconnector spring and complete instructions on how to prep your parts for best results. Or, send in your lower assembly and we’ll do it for you, complete with springs, professional work over of your parts, and return shipping included for $65.00.
Note: If you are ordering for an Armalite AR10 or Knights SR25, or using your rifle for tactical or cold weather operation, specify the JPS40 tactical spring kit with your order. In these rifles, a heavy hammer spring is necessary for ignition reliability and to eliminate the finger bounce "doubling" possibility. When you order direct, we will include this at no charge"
Hope that helps,
John F.