HK21E/23E/11E Registered Receiver (Fleming/TSC)
USP Tactical .45ACP
USP 45 Compact Tactical
S&H registered sear burst pack (TSC)
MP5F SBR (TSC)
HK53 SBR (TSC)
The one that would not fit and was out of spec I got from HK Parts and was 1/2x28. I'm using the factory 1/2x28 that came with the Zenith Z-5RS which is my shooter gun, which I should have mentioned in the first post. The factory Zenith thread protector has less knurling than the one I got from HK Parts. Live and learn I guess. The suppressor mounts perfect on my other factory HK MP5's.
My thread protectors I tried to fit the B&T suppressors over are factory HK 1/2x32 (2), so I would be surprised if they were out of spec. I assumed since the majority of HK MP5’s were not threaded barrels that B&T designed their suppressor based on non threaded three lug barrels. I will check all my other threaded barrel MP’s to see if the B&T suppressors will fit over protectors in a day or so and report back.
The HK spec. is about 15mm /.590" +.000 -.001
The B&T sleeve is about .590 with minus pins.
With B&T being a large supplier to HK I'm sure they spec. to HK barrel prints.
If your protector measures more than .5905 you might not fit a B&T.
A new MM or B&T OEM barrel w/ or w/o threads will solve all of these issues
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I purchased a Gemtech 10mm can several years ago. I have the smooth thread cover. I believe it came with the can. Then years later I purchased one of MM’s 10mm barrels which shipped with the knurled cover. Then came a time when I had to replace a busted trunnion in my Coharie 10mm so I decided to install MM’s bbl. Sure enough the can would not go on. That’s when I remembered the smooth cover from Gemtech. I believe it has their measurements engraved on it. PM me if you need that.
Gemtech apparently doesn't know the spec for a 10mm MP5 barrel (.647" +/- .001")
This is why they stopped cans for the UMP.
Depending on when you got your barrel it has a German 10mm TP.
Smooth or knurled doesn't matter on spec.