How to tell when a MP5 recoil assy is worn .
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Thread: How to tell when a MP5 recoil assy is worn .

  1. #1
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    Default How to tell when a MP5 recoil assy is worn .

    Iím still using the stock Ptr unit, over 1500 down the pipe by now.
    I loaded dome light 147 grain pills and they will cycle in this but will not cycle in a P30L.
    Thereís definitely a noticeable difference between these and factory ammo.
    Buffer has been replaced a few months ago, it has a thick buffer in there now with now damage.
    Is this normal that this system will run light loads or should I install a new recoil assy ??


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    Quote Originally Posted by convert53 View Post
    I’m still using the stock Ptr unit, over 1500 down the pipe by now.
    I loaded dome light 147 grain pills and they will cycle in this but will not cycle in a P30L.
    There’s definitely a noticeable difference between these and factory ammo.
    Buffer has been replaced a few months ago, it has a thick buffer in there now with now damage.
    Is this normal that this system will run light loads or should I install a new recoil assy ??


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    I would side with ammo being the issue if the recoil assy is only 1500 rounds old. That's If I'm interpreting what your asking correctly.
    Does it cycle full power ammo ok? Any other issues? FTF/FTE ?

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    I changed my recoil spring at 30k
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    It has no other issues, when I first got it it didnít like truncated bullets at the top or bottom of the mag. I had a bunch loaded up and my solution was to load 3-4 round nose first and then load 20 truncated, then top the mag off with 5 round nose. I burned through the that batch of bullets.
    It eats hollow points, fmj , plated without issue. Has the original extractor spring in the ptr bolt.

    I reckon Iíll just keep shooting it


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    With the hand load 147’s, are you running them in the PTR with a can? If so, added back pressure is helping the cycle. They might not be hot enough for the P30?

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    Could it be that the longer barrel in the PTR builds sufficient pressure to cycle the gun, despite being a lighter load?

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    The MP5 will cycle light loads where other stuff won't. I think it's due to the operating of the roller locking system. Specifically, those flutes in the in the barrel. I've been able to barely cycle custom loads in the MP5 where a USP won't. I can't speak for your buffer damage.

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    Concern with Skullbox and buffer damage occurs when shooting suppressed. Locking piece, recoil spring and both gap becomes becomes a factor for buffer damage. Best I can tell you is to measure bolt gap. Too often people have issues and neglect to measure bolt cap to diagnose the problem.
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    The hand loaded 147 gr are without a can.


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    I want to start with the simplest possible occurrence. The fluted chamber can get sticky fast with lower quality ammunition and handloads. Give those a quick brush. Roller delay is hyper reliable as long as you maintain the lads. I maintain that the recoil spring assembly is likely in working order.
    I suspect that the buffer damage is from hotter loads, but I don't know to what extent it has been chewed up. Are you using the factory 100 degree locking piece? Did your previous buffer fail?

    Do a run of factory 124gr FMJ.

    Slav

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