Air Arms Owners Club

Hi is their a video, or instructions on here how to to tune a mpr trigger? also where to get some crinkly washers.

Crinkly washers - Julian - BGALTD.

bripard wrote:Hi is their a video, or instructions on here how to to tune a mpr trigger? also where to get some crinkly washers.

Yes, as Raj said, Julian will supply you with the crinkle washer kit.

For your part, you need to polish the trigger sears to a mirror finish, but be very careful not to over do it and alter the profile of the sears. Take a photo of the trigger unit before you remove the sears from the posts, that way you have a ready reference for re-assembly. It is a very simple job, honestly. Another tip I can give you is to replace the trigger sear tension spring with a cut down Biro spring. Take a single coil off at a time to be sure, once removed, you can't put it back on again. When you have polished the sears, fitted them back in place with the crinkle washers, then you need to adjust the trigger to your personal preference. This is best done with the trigger fully assembled but with the side plate removed. That way you can see how the sears engage with each other, then it's far easier to make the necessary adjustments.

Hope that helps.

Mike.

Yes that certainly helps. Thank you Mike.

I did my s400 and to be honest theres is only the lower two sears to polish the upper sear was finish nicely,the lower sear where the trigger adjuster screws ride against still had the laser cutting marks on it,does make a differance once cleaned up