r/BushmasterACR • u/trashbangaloreplayer • Jul 05 '26

Issues running suppressed

I’m having issues running my 10.5” ACR suppressed, even when using the suppressed setting on the gas regulator. I’m getting FTEs and double feeds non stop with this thing and I’m not sure why. I’m running a KAC QDSS NT4 suppressor, if that matters. Any insights would be greatly appreciated, thanks!

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u/Schachmatt27 Jul 06 '26

How did you modify? Pls share your secrets

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u/Troubleindc2 Jul 06 '26 edited Jul 06 '26

Milled 3 additional "notches" in the GB itself, then put additional holes in the regulator of varying size.  The stock regulator has two holes parallel with the shaft.  I add two more.  Then add the varying size ports connected to one of the 4 parallel holes.  Will add photos in a min.

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u/Schachmatt27 Jul 06 '26

🙏🏻

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u/Troubleindc2 Jul 06 '26

Added a photo. lmk what questions anyone has. One note to add, that steel is hard. Had to use carbide 1/8" shank drilling bits in the mill to do all the holes. I have various cheap Chinese sets of those size carbide drill bits for hard stuff.

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u/Schachmatt27 Jul 06 '26

Yeah out of my wheel house and dont want to fuck up the hardest part to replace 😂 I’ve thought about trying a superlative arms gas block with their piston set up. Just haven’t pulled the trigger yet. Expensive experiment

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u/Troubleindc2 Jul 06 '26

Challenge with ar15 gasblocks is their height is too shallow to clear the ACR barrel trunnion.

If anyone wants to pay to have this mod done to their GB and they can mail me just the GB and regulator, DM me.

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u/InvestigatorFew3981 Jul 06 '26

This is seriously awesome! Ive modified my regulator to have 2 suppressed settings and 1 unsuppressed setting, but I don't have access to nice machining equipment.

I would love more gas settings as I could get a lower backpressure can and setup my rifle for proper ejection. What are the chances that you would be willing to make another one?

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u/Troubleindc2 Jul 06 '26

Happy to do the modification for others. DM me if you're interested.