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Discussion Starter · #1 ·
I like to pick one up from HK Parts the #28 Locking piece for my MP5K but dont know any real advantage from HK vs. RCM except it's much cheaper for RCM product, thanks for any input. Also should I concern about gapping once I switch out the #16 for the #28?
 

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HK recommends the #28 if you're using the stock and/or the suppressor. If you have no plans to do either, then you don't need the additional LP. For me, I only put HK factory parts in my HKs. No real difference between the two brands, but "factory" matters to me.
 

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+1 and I will expand on what Marine said...

The #28 for suppressed 147-gr or heavier in the MP5K with stock. Unsupressed with stock, use the standard 100-degree LP.

I run an RCM LP in almost all my guns. That said, the German LP's have 30+ years of field experience but I do suspect that in 30 years from now, people will be saying the same about the RCM parts.
 

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I like to pick one up from HK Parts the #28 Locking piece for my MP5K but dont know any real advantage from HK vs. RCM except it's much cheaper for RCM product, thanks for any input. Also should I concern about gapping once I switch out the #16 for the #28?
You need to check bolt gap when changing anything connected with the locking piece, bolt and/or the actual gun (i.e. no two MP5Ks are identical with the same bolt and locking piece).

That said I have for years run my SP89/MP5K-PDW with a #28 locking piece and 124gr NATO ammo to slow down the rate some (which in mine it did), with no issues. I tend to run a clean gun well lubed gun for less than 500 rounds in a day. On some guns and/or if dirty / dry one can have or in theory can have issues with insufficient energy to cycle ... then again my day job/company is seeing why things break and not using the MP5K-PDW ;-).

Take Care
 

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Discussion Starter · #7 ·
+1 and I will expand on what Marine said...

The #28 for suppressed 147-gr or heavier in the MP5K with stock. Unsupressed with stock, use the standard 100-degree LP.

I run an RCM LP in almost all my guns. That said, the German LP's have 30+ years of field experience but I do suspect that in 30 years from now, people will be saying the same about the RCM parts.
Joe, thanks for the adviced, what # for the standard 100-degree LP? Is this good for 115gr w/stock? what about #16? is that only good for w/o stock/can?
 

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Joe, thanks for the adviced, what # for the standard 100-degree LP? Is this good for 115gr w/stock? what about #16? is that only good for w/o stock/can?
The no number locking piece is the 100 degree one for the full size MP5. Have not seen any issues with the 100 degree one with a stock and Win White Box 115gr in several MP5K-PDWs nor the #16 except possible a few failures to feed per several thousand rounds (the higher cycle rate can almost get ahead of the mag spring ...) but the difference is in the noise level with gun getting dirty, extractor spring bending and bad hair days ;-).
 
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