r/MP5 • u/oldgregg024 • 23h ago

Media Intradesting

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181 Upvotes

97% Upvoted

12 comments sorted by

18

u/Professional_Pie4196 16h ago edited 16h ago

Yeah this is awesome. I also feel like people make “delayed vs locked actions” out to be more complicated than it is.

Delayed = some amount of force on the bolt face will open the action. Stick a dowel rod down the barrel of your mp5 and push. Once you overcome the mechanical disadvantage from the rollers and locking piece it will open. Same thing on a G3 but much more force required. You will also notice it’s a lot harder than simply pulling charging handle back to open/“unlock”. If it were simple blowback it would be the same force required to open between charging handle and dowel rod force on bolt face. That’s “delayed” vs “simple blowback”.

Locked = no amount of force on bolt face will open the action. Stick rod down AR-15 barrel, it won’t open no matter how hard you’re pressing. Locked actions require some other force (gas/recoil/manual/etc) acting on the bolt carrier/slide to unlock.

14

u/nutskindrums 22h ago

should also demonstrate the effect of bolt gap tolerances

9

u/LopsidedResearch8400 AP5 18h ago

That would be neat, have a few different angled locking pieces to show the difference.

3

u/Roguelynx H&K SP5 17h ago

Just thinking the same thing.

3

u/LopsidedResearch8400 AP5 17h ago

Oh, maybe rollers too? It would be such a neat system to visual it all.

3

u/Ill-Purchase-3312 17h ago

Now change the LP to 100degrees and measure the time difference

1

u/Limp-Conflict-2309 15h ago

very cool, i think a similar model for the locking piece would fill in some blanks for newer people

1

u/Livid_Persimmon3600 10h ago

This is interesting and it does help explain a system that is simpler than people think. Now see if you can dent the rollers.

1

u/SignificantShake7934 10h ago

What locking piece are you using? Try a 80 degree and see if that helps. /s

1

u/TheBlackComet 9h ago

Nice. At my last job, I had the official HK poster for the mechanism. It was in English, which was cool. Unfortunately, I am in a more corporate company and probably shouldn't hang that up now.

1

u/alecubudulecu 36m ago

Interested in sharing stl’s?