AR Sponsor
Posted: 5/14/2010 5:41:02 PM EDT
|
Anyone know much about the JP Enterprises AR trigger kits or more importantly their customer service?
I just bought and installed one in a Oly Arms K-16. It was a PITA but I got it done and it seemed to work perfectly until I shot it. I fired about 5-10 rounds and then it doubled on me. I thought it might have been bump firing, so I racked the bolt and let her fly shut...............It slam fired. Luckily it was pointed in a safe direction. I followed the directions and watched the provided video. I don't think I did anything wrong with the installation. I have called and emailed JP but since it's the weekend I haven't spoke to anyone yet. I put the rifle up and won't be shooting it anymore until it's fixed. I'm just wondering if JP will fix it for free??????????? I spent close $150 on the trigger kit, the darned thing should at least function properly. swampf0x |
| You may have the disconnect timed wrong its not catching the hammer. In other word you filed too much off it. I have installed several of these and trial and error has taught me this is likely your problem. Or you have the sear engangement running on the ragged edge if it goes off when you slam the bolt. Other than that there can't be much else wrong. Re-adjust and re-time the disconnect and you will most likely be OK. |
|
Only two adjustment points so it's an easy one to figure out as long as you have the right size pin group for the receiver it's being used (read if the receiver is a .154 size then you need that size group, and if the receiver is a .174 then you need that size group).
With the FCG out, dry fit the trigger pin to the trigger and the disco. Then install the disco with spring (large coil side down) to the trigger and again dry fit the pin again outside the rifle. In either case, the pin should cleanly rotate on the disco and trigger without binding, and the disco should not be binding in the trigger slot as well. Now put the FCG back in, and set the back screw. To do this, set the selector to safe, then tighten the rear screw until all extra travel has been take out between the back of the trigger to the selector on safe. Now that part that is not covered in the manual, cock the hammer back with the trigger untouched, and check the free distances from the back hammer sear to the disco sear when they get as close to each other as possible. The free range/gap between the two should be in the .001 to .002. If greater, you will need to remove metal from the bottom/front of the disco where it seats against the front/ top or the trigger to correct the enlarge free gap. Now that disco has been timed correctly to retain the hammer during reset as long as possible, lets address the front screw Pull the trigger back and start working the hammer up and down as you adjust the front screw. You want the trigger hammer to just miss the hammer sear, then back the screw out about 1/2 turn to add in a bit of extra travel needed for a clean release without having to really pull hard on the trigger to get such. Lastly, confirm that the spring are installed in the correct positions and wind directions, and the hammer spring legs are resting on top of the hammer pin. 
|
|
I checked my rifle out a minute ago. Made sure it was empty pulled back the charging handle and let er go. It slam fired. I done it several more times and it did the same thing. Then I noticed that the trigger pin was not centered. I centered it and now I can't get it to slam fire. Perhaps I need pins with e clips on the ends???
In function testing I found the disconnector to be working properly. I can pull the trigger, hold it back while resetting the hammer. I mash it down as far as it will go and the disco catches it. I release the trigger and the disco lets go but not the hammer. I pull the trigger again and the hammer falls swampf0x |
|
Legs of the hammer spring seat into the side groove on that pin to retain it into the receiver.
IF the hammer spring is installed upside down (leg wind coming out of the top, not the bottom) or the spring leg too wide for the spring grove, then the pin is not going to stay in position. Double check the hammer spring install, and even confirm that the spring leg and pin groove are the correct size and match each other. |
|
Pull the trigger pin and while spinning it in a drill, slightly widen/deepen the groove so it retains the hammer spring leg.
Also, before you start spin filing, note the side that the pin groove needs to be enlarged to center the pin in the receiver. If you are looking for external retained FCG pins, then KNS has you covered. http://www.knsprecisioninc.com/c/GunParts.html |
|
Thanks. I went ahead and ordered a set of JP oversized anti walk pins. Cost about $15 delivered. I think that will solve my problem.
I ran about 50 rounds of ammo through it today keeping a close eye on the pins and it ran flawlessly. So..............I guess this was my fault after all. JP gets 2 thumbs up from me now. swampf0x |
| I would have just deepened the annular side groove on the pin, but will say that I'm not a huge fan of external C clip pins since they do tend to mar the sides of the receiver (both in action and installing/removing them as well and the reason that I suggested the KNS pins instead). |
AR Sponsor