Nimitz Posted July 5, 2017 Share Posted July 5, 2017 So finally got around to sending off my gas port to be opened back up to the Gen 1 spec. Got it back last week and took it out this morning to see where I was. First tested my original 123 PF load which would not cycle and now I had 100% cycling. So far so good. I then switched to a new load I made last night which the chrono said was 116 PF. Well I had 100% cycling of those as well. I'm going to make a batch of 110 PF rds and see if those work too .... the gun is already flat with only a slight twitch of the dot but since this is primary for SC, getting it to perform like a rimfire gun would be valuable if possible ... Link to comment
Aircooled6racer Posted July 5, 2017 Share Posted July 5, 2017 Hello: So how big of hole did you put in the gas port? Does it slam back now with 130PF loads or is it bleeding off the gas? Thanks, Eric Link to comment
Nimitz Posted July 6, 2017 Author Share Posted July 6, 2017 (edited) Honestly I have no idea .... When I contacted the guys who did the work their website just said "Sig MPX gas port service" and a few words about opening up the ports to run lighter loads. I told them what I was trying to do and they said they could do it. when I ran the 123 PF loads through It this morning the recoil seemed identical to what is was before, the only difference was that it was no longer a single shot PCC ... ? I didn't try, nor do I plan to, run any heavier loads through it ... Edited July 6, 2017 by Nimitz Link to comment
Neomet Posted July 7, 2017 Share Posted July 7, 2017 Most 'smiths open it to between .060 and .065. I believe, but am not certain ZRT goes to .065. Gen IIs come choked down to .045. Link to comment
Aircooled6racer Posted July 8, 2017 Share Posted July 8, 2017 Hello: I have heard some are opening them up a little larger than that. Thanks, Eric Link to comment
TISCHLJ Posted July 8, 2017 Share Posted July 8, 2017 Following.. I know Taylor Pickerell is also offering this service. The MPX does like some gas... Link to comment
SergioSF Posted July 8, 2017 Share Posted July 8, 2017 I had mine opened up to .060. What are the concerns about going much larger? Just more wear and tear on the gun or is it a safety issue? Link to comment
surgdog Posted July 8, 2017 Share Posted July 8, 2017 18 hours ago, TISCHLJ said: Following.. I know Taylor Pickerell is also offering this service. The MPX does like some gas... I tried multiple times to get in touch with Taylor and never could. I used ZR Tactical. They were very quick (barrel shipped and back in less than a week) and it works great now where I had a jam-o-matic before with my reloads. Recommend ZR Tactical very much. Link to comment
Nimitz Posted July 8, 2017 Author Share Posted July 8, 2017 yep. never got any response (email or phone) from Pickerell either ... Finally found ZR Tactical & in a week it was done. I suspect I'll be able to run 110 PF loads at 100% once I'm done. Noting wrong with my current 116 PF but lower is better .. Link to comment
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