Posted: 6/30/2026 7:14:51 PM EDT
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So I randomly came across a SUURG upper (without suppressor or burn guard) at auction and found a way to make it my own. I called LT, begged them to search the floorboards of Mark’s truck, and they actually found me their shop demo can and a new burn guard. I now have a complete gun, but it has no caliber markings. Can any of you fine gentleman show me the markings on yours? I am 99.9% sure it is 300Blk, but I am being cautious. The muzzle device is marked 308S Attached File |
"Our silences are as articulate as our stories, are part of them, and they too can be held against us."
-Eddie Conlon
-Eddie Conlon
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I pulled the rail and under the barrel nut and gas tube I can see “0 BLK” protruding. I’m not crazy right?Attached File |
"Our silences are as articulate as our stories, are part of them, and they too can be held against us."
-Eddie Conlon
-Eddie Conlon
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I emailed them, they were prompt, and then he asked to call me and said he could sell me the shop demo can. Even marked as such, which was pretty neat Attached File |
"Our silences are as articulate as our stories, are part of them, and they too can be held against us."
-Eddie Conlon
-Eddie Conlon
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Originally Posted By Fernman: I emailed them, they were prompt, and then he asked to call me and said he could sell me the shop demo can. Even marked as such, which was pretty neat https://www.ar15.com/media/mediaFiles/20730/IMG_0623_jpeg-3787680.JPG Just to make sure....your SUURG box say caliber is 5.56. If your barrel is 300BO, is the can safe to use? My Tranqilo is good on my .308, but I'd double check with the box marked like that. |
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Originally Posted By kavants: Just to make sure....your SUURG box say caliber is 5.56. If your barrel is 300BO, is the can safe to use? My Tranqilo is good on my .308, but I'd double check with the box marked like that. The SUURG can isn’t caliber-specific in the normal suppressor sense. The SUURG muzzle device extends all the way through the can, so the bullet isn’t passing through a traditional baffle stack. 
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Originally Posted By razARback: The SUURG can isn’t caliber-specific in the normal suppressor sense. The SUURG muzzle device extends all the way through the can, so the bullet isn’t passing through a traditional baffle stack. https://i0.wp.com/attackcopter.com/wp-content/uploads/2023/06/larue-tactical-suurg-upper-receiver-2.jpg?resize=640%2C427&ssl=1 Great. I was worried about bad things happening. |
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Originally Posted By razARback: The SUURG can isn’t caliber-specific in the normal suppressor sense. The SUURG muzzle device extends all the way through the can, so the bullet isn’t passing through a traditional baffle stack. https://i0.wp.com/attackcopter.com/wp-content/uploads/2023/06/larue-tactical-suurg-upper-receiver-2.jpg?resize=640%2C427&ssl=1 Ah, that makes sense. Thought the burn guard was the fixed part... |
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Originally Posted By razARback: The SUURG can isn’t caliber-specific in the normal suppressor sense. The SUURG muzzle device extends all the way through the can, so the bullet isn’t passing through a traditional baffle stack. https://i0.wp.com/attackcopter.com/wp-content/uploads/2023/06/larue-tactical-suurg-upper-receiver-2.jpg?resize=640%2C427&ssl=1 Originally Posted By razARback: Originally Posted By kavants: Just to make sure....your SUURG box say caliber is 5.56. If your barrel is 300BO, is the can safe to use? My Tranqilo is good on my .308, but I'd double check with the box marked like that. The SUURG can isn’t caliber-specific in the normal suppressor sense. The SUURG muzzle device extends all the way through the can, so the bullet isn’t passing through a traditional baffle stack. https://i0.wp.com/attackcopter.com/wp-content/uploads/2023/06/larue-tactical-suurg-upper-receiver-2.jpg?resize=640%2C427&ssl=1 Wouldn't the muzzle device be caliber specific, or are they .30 cal +? |
God will not look you over for medals, diplomas, or degrees – but for scars
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Originally Posted By SecretSquirell: Wouldn't the muzzle device be caliber specific, or are they .30 cal +? Originally Posted By SecretSquirell: Originally Posted By razARback: Originally Posted By kavants: Just to make sure....your SUURG box say caliber is 5.56. If your barrel is 300BO, is the can safe to use? My Tranqilo is good on my .308, but I'd double check with the box marked like that. The SUURG can isn’t caliber-specific in the normal suppressor sense. The SUURG muzzle device extends all the way through the can, so the bullet isn’t passing through a traditional baffle stack. https://i0.wp.com/attackcopter.com/wp-content/uploads/2023/06/larue-tactical-suurg-upper-receiver-2.jpg?resize=640%2C427&ssl=1 Wouldn't the muzzle device be caliber specific, or are they .30 cal +? Yes, the muzzle device on my 5.56 SUURG has an ID of about .260”. The OD of the muzzle devices should all be the same, matching the SURG 2.0 can ID. My understanding is the bore through the muzzle device is what changes by caliber. |
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Originally Posted By razARback: Yes, the muzzle device on my 5.56 SUURG has an ID of about .260”. The OD of the muzzle devices should all be the same, matching the SURG 2.0 ID. My understanding is the bore through the muzzle device is what changes by caliber. Originally Posted By razARback: Originally Posted By SecretSquirell: Originally Posted By razARback: Originally Posted By kavants: Just to make sure....your SUURG box say caliber is 5.56. If your barrel is 300BO, is the can safe to use? My Tranqilo is good on my .308, but I'd double check with the box marked like that. The SUURG can isn’t caliber-specific in the normal suppressor sense. The SUURG muzzle device extends all the way through the can, so the bullet isn’t passing through a traditional baffle stack. https://i0.wp.com/attackcopter.com/wp-content/uploads/2023/06/larue-tactical-suurg-upper-receiver-2.jpg?resize=640%2C427&ssl=1 Wouldn't the muzzle device be caliber specific, or are they .30 cal +? Yes, the muzzle device on my 5.56 SUURG has an ID of about .260”. The OD of the muzzle devices should all be the same, matching the SURG 2.0 ID. My understanding is the bore through the muzzle device is what changes by caliber. So, he shouldn't be shooting 300BO through it then. |
God will not look you over for medals, diplomas, or degrees – but for scars
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Originally Posted By SecretSquirell: So, he shouldn't be shooting 300BO through it then. Originally Posted By SecretSquirell: Originally Posted By razARback: Originally Posted By SecretSquirell: Originally Posted By razARback: Originally Posted By kavants: Just to make sure....your SUURG box say caliber is 5.56. If your barrel is 300BO, is the can safe to use? My Tranqilo is good on my .308, but I'd double check with the box marked like that. The SUURG can isn’t caliber-specific in the normal suppressor sense. The SUURG muzzle device extends all the way through the can, so the bullet isn’t passing through a traditional baffle stack. https://i0.wp.com/attackcopter.com/wp-content/uploads/2023/06/larue-tactical-suurg-upper-receiver-2.jpg?resize=640%2C427&ssl=1 Wouldn't the muzzle device be caliber specific, or are they .30 cal +? Yes, the muzzle device on my 5.56 SUURG has an ID of about .260”. The OD of the muzzle devices should all be the same, matching the SURG 2.0 ID. My understanding is the bore through the muzzle device is what changes by caliber. So, he shouldn't be shooting 300BO through it then. The barrel in his SUURG upper is stamped 300 BLK, so yes, he should shoot 300 BLK through it. The SURG 2.0 can has a giant hole (~3/4”) through it that seats on the OD of any of the extended SUURG muzzle devices, regardless of caliber. So even though the box he got from LT says it is 5.56, the SURG 2.0 can itself is really caliber agnostic. Hope this helps add some clarity. Attached File |
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Originally Posted By razARback: The barrel in his SUURG upper is stamped 300 BLK, so yes, he should shoot 300 BLK through it. The SURG 2.0 can has a giant hole (~3/4”) through it that seats on the OD of any of the extended SUURG muzzle devices, regardless of caliber. So even though the box he got from LT says it is 5.56, the SURG 2.0 can itself is really caliber agnostic. Hope this helps add some clarity. https://www.ar15.com/media/mediaFiles/284972/IMG_5681_jpeg-3789418.JPG Originally Posted By razARback: Originally Posted By SecretSquirell: Originally Posted By razARback: Originally Posted By SecretSquirell: Originally Posted By razARback: Originally Posted By kavants: Just to make sure....your SUURG box say caliber is 5.56. If your barrel is 300BO, is the can safe to use? My Tranqilo is good on my .308, but I'd double check with the box marked like that. The SUURG can isn’t caliber-specific in the normal suppressor sense. The SUURG muzzle device extends all the way through the can, so the bullet isn’t passing through a traditional baffle stack. https://i0.wp.com/attackcopter.com/wp-content/uploads/2023/06/larue-tactical-suurg-upper-receiver-2.jpg?resize=640%2C427&ssl=1 Wouldn't the muzzle device be caliber specific, or are they .30 cal +? Yes, the muzzle device on my 5.56 SUURG has an ID of about .260”. The OD of the muzzle devices should all be the same, matching the SURG 2.0 ID. My understanding is the bore through the muzzle device is what changes by caliber. So, he shouldn't be shooting 300BO through it then. The barrel in his SUURG upper is stamped 300 BLK, so yes, he should shoot 300 BLK through it. The SURG 2.0 can has a giant hole (~3/4”) through it that seats on the OD of any of the extended SUURG muzzle devices, regardless of caliber. So even though the box he got from LT says it is 5.56, the SURG 2.0 can itself is really caliber agnostic. Hope this helps add some clarity. https://www.ar15.com/media/mediaFiles/284972/IMG_5681_jpeg-3789418.JPG ETA: I need to read more gooder. 
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God will not look you over for medals, diplomas, or degrees – but for scars
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Originally Posted By soonerman: You have a .300BLK-barreled SUURG upper, with a .308S SUURG muzzle device. Good to go. Cool story on getting the can and guard!  I just went and reread the OP. I glanced over the part that he already had a 308 MD on.
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God will not look you over for medals, diplomas, or degrees – but for scars