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Posted: 5/19/2022 12:15:46 PM EDT
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I’m ramping up for an M249S Para conversion and I was hoping that some of you guys had experience with suppressing this platform. From what I can tell, the older adjustable gas barrel assemblies only go from normal to adverse settings. The M249S para barrels are pin and welded to get to 16”. M249 Para barrels seem to be threaded 9/16x24 and require a specific muzzle device to clear the gas plug. If I cut and thread an 18” 5.56 barrel to ~ 14”, will I need to adjust the gas to run a silencer on full auto? I’ve found a source for 300BLK M249 barrels. How difficult will it be to run subsonic ammo reliably? Lastly, is there someone who makes true adjustable gas settings for the M249 to switch between suppressed, regular and adverse conditions? Right now I’m planning on the NT4 for 5.56 but everyone will get some beltfed time eventually. Thanks |
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If you have the spring plunger style gas block, you can dremel modify the block with a cutoff disc carefully, to support an extra detent position if needed, and cut the flat on the regulator at 120 degrees to the other to make a new position like a 240 3 position regulator, and then drill a new port of whatever size you need with a carbide bit very slowly and carefully. 5C hex collet blocks will support 120 degree indexes, just tram one flat, tighten, and refixture the hex block. I think I needed the extra detent on our barrel, and just made a ramp adjacent the other detent to continue rotating the knob to that position. We made a suppressor gas port on our 240 Lima regulator and it worked really well. It was a one position regulator though Ive seen older Army regulators that used to be three positions giving units a choice of what rate of fire they wanted. In Iraq on my first tour we had those. We started the deployment on the low setting and ran into a few minor malfs, and by the end the vehicle mounted guns were setting 3, where the rof is like 1200rpm almost like a mg42, you pull the trigger and the belt is moving so fast it flaps up and down from velocity of the belt pull. Dismounted or static most were then setting two, a little more conservative on ammo consumption in the applications where you can’t just drive away at will. |
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Great info. Thank you. Quoted: If you have the spring plunger style gas block, you can dremel modify the block with a cutoff disc carefully, to support an extra detent position if needed, and cut the flat on the regulator at 120 degrees to the other to make a new position like a 240 3 position regulator, and then drill a new port of whatever size you need with a carbide bit very slowly and carefully. 5C hex collet blocks will support 120 degree indexes, just tram one flat, tighten, and refixture the hex block. I think I needed the extra detent on our barrel, and just made a ramp adjacent the other detent to continue rotating the knob to that position. We made a suppressor gas port on our 240 Lima regulator and it worked really well. It was a one position regulator though Ive seen older Army regulators that used to be three positions giving units a choice of what rate of fire they wanted. In Iraq on my first tour we had those. We started the deployment on the low setting and ran into a few minor malfs, and by the end the vehicle mounted guns were setting 3, where the rof is like 1200rpm almost like a mg42, you pull the trigger and the belt is moving so fast it flaps up and down from velocity of the belt pull. Dismounted or static most were then setting two, a little more conservative on ammo consumption in the applications where you can’t just drive away at will. |
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Machine shop local to me has their 07/02 and builds cans. They also have a postie M249 in 300 BLK with an adjustable gas block set up. Might be worth giving them a call and see if they would be willing to share their experience. Attached File ***ETA - NOT affiliated with this company and this is not an advertisement for them*** |
| This guy made one that's adjustable with a set screw: https://www.fnforum.net/threads/m249-adjustable-gas-block.226523/ |
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Quoted: Machine shop local to me has their 07/02 and builds cans. They also have a postie M249 in 300 BLK with an adjustable gas block set up. Might be worth giving them a call and see if they would be willing to share their experience. https://www.ar15.com/media/mediaFiles/432480/126052266_2104415653025442_8754250063705-2395142.JPG ***ETA - NOT affiliated with this company and this is not an advertisement for them*** That's hot |
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