15-22 Hammer spring

[919]

Sorry I'm answering my own question but maybe it can help someone. I emailed JP with the same question and here is their very promt reply.

"I would use the stock, full power hammer spring and the light JP trigger spring. Rimfire is ignition-sensitive enough as it is. Reducing the hammer spring tension only exacerbates the issue."

I will post the result with the new spring after I install it.

I finally got out to the range to try the spring that I installed. I had also done some slight polishing with a Dremel and jewelers polish as described in this thread AR15 Build . I left in the stock hammer spring and only put in the JP trigger spring. The trigger is much better. The pull is noticeably lighter and smoother. Still not great but a lot better.

 

[emmandpeashooter]

i think the best way to answer this question is to buy a second 15-22 and cut the spring. fire it about 10,000 times and compare to a bent spring after 10,000 rounds. anyone want to chip in for the gun and ammo? i'll do all the work

Trust me. I'm all over it!

 

[chuck s]

Since the revival of this thread I have about 500 rounds out of my 15-22 after performing the 15 Minute Trigger Job. Totally reliable ignition.

A $120 Rock River 2 Stage trigger is no longer on my shopping list.

-- Chuck

 

[Brett248Vista]

YouTube - AR trigger break in / tweaking "MUST SEE"

No idea how well this works, but people seem to think this is a good trigger tweak.

 

[VMaxSplat]

Okay, that's what I needed to know. I did the 15 minute trigger job (see link at the end) and went and put about 75 rounds through my gun and there was about 6 times that the hammer just didn't strike hard enough. I should have only done the trigger spring instead of doing the trigger and hammer springs. I bent the hammer spring around a little bit and it seems to strike a little bit harder, I might just try it tomorrow and see if it works better. The trigger pull does feel a lotttt better though. 15 Minute Practical Trigger Job for the AR-15

I didn't read thru 3 pages of this thread, but in case you still need the info, the fix is to lighten the hammer by "bobbing" the hook (with a cut off wheel). A JP speed hammer will do the same thing. Hammer speed is reduced by the lighter hammer spring. To get the speed back (and ignition reliability), the hammer mass must be reduced.