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Posted: 5/18/2016 9:26:01 PM EDT
Picked up a Sig MPX gen 2 yesterday and went to the range today. It won't cycle. It will only fire once and kept getting stoved, won't feed properly. Tried the range's MPX's (rental) magazine. Still the same problem. Took everything apart, cleaned it, oiled it. Still the same problem.

Looks like the same problem as this one: http://sigtalk.com/sig-sauer-rifles/52192-new-mpx-not-loading.html

Tried the range's rental MPX's magazine and it won't cycle.
Link Posted: 5/18/2016 11:04:38 PM EDT
[#1]
Piston system if I'm correct? Open gas all the way. Refer to manual for gas adjustment instruction.

ps: Welcome to the piston problem life
Link Posted: 5/18/2016 11:11:06 PM EDT
[#2]
Discussion ForumsJump to Quoted PostQuote History
Quoted:
Piston system if I'm correct? Open gas all the way. Refer to manual for gas adjustment instruction.

ps: Welcome to the piston problem life
View Quote


They aren't adjustable.  
Link Posted: 5/19/2016 10:32:30 AM EDT
[#3]
*UPDATED* Took the bolt out, cleaned it, lubed it, removed the o-ring from the extractor spring. Went back to the range and shot 400 rounds with no issue! ~doing the happy dance~
Link Posted: 5/20/2016 8:42:55 AM EDT
[#4]
Link Posted: 5/20/2016 10:38:30 AM EDT
[#5]
Something isn't right there. You shouldn't have had to take the O ring off to make it function properly. The O ring helps ejection not the opposite.
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