Suppressor mount question

NiceOldDouble

NiceOldDouble

Well-Known Member
Benefactor
Vendor
Joined
Dec 17, 2016
Messages
2,114
Location
Durham
Rating - 100%
111   0   0
Was running a 14.5” pin and weld 5.56. Doing the suppressor thing now with SOT. Wish to now suppress this 14.5” upper, but cannot use crush washer, which was what was there with a non-suppressor flash hider.

Currently have Rugged Razors with the R3 mount. The R3 does not get me to 16”. Rugged makes a R3L (long) that would, but they do not make it in 1/2x28.

I am new-ish at this. I appreciate honest advice, rather than smart ass. I would rather not ditch this barrel. I would rather not do another paid SBR tax stamp (lower came after ruling), I just need a longer flash hider that will work with the Razor, or get an entirely different suppressor and mount dedicated to this particular gun.
 
Assuming you have the razor556?

I think you are SOL. Rugged doesn’t have a 1/2x28 mount that’s long enough. I’m not sure if the razor 556 could fit the extra length of the longer flash hider.

I’ve got a 14.5 and a Razor556 and I’m just going to run that upper (love it) on a SBR lower. I’m running the M3 mount, so I completely gave up hope on reaching 16”
 
Gray said:
Assuming you have the razor556?

I think you are SOL. Rugged doesn’t have a 1/2x28 mount that’s long enough. I’m not sure if the razor 556 could fit the extra length of the longer flash hider.

I’ve got a 14.5 and a Razor556 and I’m just going to run that upper (love it) on a SBR lower. I’m running the M3 mount, so I completely gave up hope on reaching 16”
Click to expand...
Not SOL if you don’t mind the brake version

Edit…forgot they now have the Razor556. The FAQ doesn’t address the Razor556.

C83292DA-7C09-449B-B1B9-EDB75435E0C0.jpeg
 
Last edited:
Gray said:
Assuming you have the razor556?

I think you are SOL. Rugged doesn’t have a 1/2x28 mount that’s long enough. I’m not sure if the razor 556 could fit the extra length of the longer flash hider.

I’ve got a 14.5 and a Razor556 and I’m just going to run that upper (love it) on a SBR lower. I’m running the M3 mount, so I completely gave up hope on reaching 16”
Click to expand...
I’ve got a pair of Razor 7.62’s. R3 on both the 5.56’s and 300blk’s. The R3L works with the 7.62 can, but they don’t make it for 1/2x28. Not sure why not.
 
NiceOldDouble said:
I’ve got a pair of Razor 7.62’s. R3 on both the 5.56’s and 300blk’s. The R3L works with the 7.62 can, but they don’t make it for 1/2x28. Not sure why not.
Click to expand...
Edit, they do still make the 1/2x28 in the flash hider…

3AECB177-F0C4-40CB-8D35-F2CB10D90245.jpeg

I posted this FAQ in the response I edited above…apparently they made the R3 in 1/2X28 at some point based on this response. I also have the 762 version that I use on 308, 300 and 556 occasionally, but not needing the extended version for any of the hosts.

332A90DF-243B-4EB0-A068-37AA42CF6A22.jpeg
 
Last edited:
willpgn said:
I posted this FAQ in the response I edited above…apparently they made the R3 in 1/2X28 at some point based on this response. I also have the 762 version that I use on 308, 300 and 556 occasionally, but not needing the extended version for any of the hosts.

View attachment 590172
Click to expand...
I have the R3 on 5.56 guns, it’s the L version that they don’t make in 1/2x28.
 
Gray said:
I’ll have to check on the 556 version and report back.
Click to expand...
I would assume that the 30 cal version in 1/2X28 would work with the 556 razor as they have the same attachment method and I don’t think there is any difference in outside dimensions of the taper and threads. Could be wrong though!!!
 
Last edited:
NiceOldDouble said:
I have the R3 on 5.56 guns, it’s the L version that they don’t make in 1/2x28.
Click to expand...
That’s interesting because the note on page of the one above (normal R3) says it will get a 14.5 to 16. Is the difference just the crush washer? If so, you could get a 556 shim pack to stand it off a little more.
 
willpgn said:
It would seem that the 30 cal version in 1/2X28 would work with the 556 razor as they have the same attachment method and I don’t think there is any difference in outside dimensions of the taper and threads. Could be wrong though!!!
Click to expand...
The regular length R3’s are made in either thread pitch. Even though the FAQ says the they make the R3L for both pitches, they do not.
 
NiceOldDouble said:
The regular length R3’s are made in either thread pitch. Even though the FAQ says the they make the R3L for both pitches, they do not.
Click to expand...
Interesting…How much are you short of 16 with a normal 7.62 R3 flash hider installed? It states on the 762 R3 page that they can make 14.5 get to 16. If it doesn‘t get it to 16, they need to change their statements on that page.

9D88965D-843F-4C92-A079-D1FF637BDF8B.jpeg
 
@NiceOldDouble it seems I fibbed a bit in the first response. I went to measure the length difference between the 762 R3 flash hider (of which I have quite a few) and the 3 port brake version. I don’t have the brake version on any, like I thought (it was a 4 port brake for an OSS can that I was thinking of).

May be worth emailing Rugged to get a measurement on the 3 port brake to ensure it will get you to 16. They have been good with communications in my experience.
 
Last edited:
Gray said:
Assuming you have the razor556?

I think you are SOL. Rugged doesn’t have a 1/2x28 mount that’s long enough. I’m not sure if the razor 556 could fit the extra length of the longer flash hider.

I’ve got a 14.5 and a Razor556 and I’m just going to run that upper (love it) on a SBR lower. I’m running the M3 mount, so I completely gave up hope on reaching 16”
Click to expand...
I got curious and sent Rugged an email to see if you can use the 7.62 R3 or the 7.62 brake versions in 1/2x28 with a 556 Razor can. I haven’t noticed any warnings saying to not do this on the various site pages I’ve looked at. One of those combos could get someone to 16 with a 556 Razor if they are compatible. Hopefully I’ll hear back soon.

@NiceOldDouble I also asked for overall lengths of the 3 port brake and the R3L flash hider. The normal R3 is 1-15/16 inches long per my quick tape measurement. Seems like they would have those specs on their site somewhere and I’ll suggest that after their response.
 
Tagged, I have also been looking for an r3l in 1/2x28 to use on a 556. Only thing I’ve seen is the .30 cal r3L threaded 1/2x28 but wasn’t sure if it would work on a 556 gun.
 
The R3 flash hider is 1 9/16” long.

It appears my barrel is a little shorter than 14.5”, because I’m 1/16” too short with the R3 installed. I’m treating it like 1/8” too short just to be extra safe. 1/8” of shims seems excessive, which is why I hopeful about the R3L in 1/2x28.
 
Pbj ak said:
Tagged, I have also been looking for an r3l in 1/2x28 to use on a 556. Only thing I’ve seen is the .30 cal r3L threaded 1/2x28 but wasn’t sure if it would work on a 556 gun.
Click to expand...

What can do you have (556 Razor or 762 Razor)? The 762 R3 1/2x28 will work fine with the 556 gun…what we don’t know is if the 762 R3 will work with the 556 Razor can (hopefully Rugged responds to my question above soon). If you have the 762 Razor can and are using it on a 556 gun, you would be fine to use the 762 muzzle devices and those should get you to 16”.

NiceOldDouble said:
The R3 flash hider is 1 9/16” long.

It appears my barrel is a little shorter than 14.5”, because I’m 1/16” too short with the R3 installed. I’m treating it like 1/8” too short just to be extra safe. 1/8” of shims seems excessive, which is why I hopeful about the R3L in 1/2x28.
Click to expand...
Interesting again! I measured all of mine this morning and I got from 1-15/16” to 2-1/16” (basically 2 inches…hard to get accurate with a tape while they are mounted) on 3 of them from the flat bottom to the tine end. Apparently I also have a R3L, and it was 2-5/8” long.

At 1-9/16”, I am guessing that you have the 556 R3 and not the 762 R3 with 1/2X28 threads. I think that’s why we are seeing a difference in measurements between ours. Even the picture of the two on the site make them look different and the top ridge between the two look different as well (see below). I would bet that the 762 R3 is what you need, especially since you have the 762 Razor can. The 762 R3 should get you at least 3/8” more length per my measurements compared to yours.

I am also assuming the 762 3 port brake version is as long or longer than the 762 R3 since it has the note about making a 14.5 reach 16. Hopefully, I’ll hear back from them soon.

DC26BCFF-82CA-4A3A-A7D9-E23F253BE99A.jpeg
 
Last edited:
willpgn said:
What can do you have (556 Razor or 762 Razor)? The 762 R3 1/2x28 will work fine with the 556 gun…what we don’t know is if the 762 R3 will work with the 556 Razor can (hopefully Rugged responds to my question above soon). If you have the 762 Razor can and are using it on a 556 gun, you would be fine to use the 762 muzzle devices and those should get you to 16”.


Interesting again! I measured all of mine this morning and I got from 1-15/16” to 2-1/16” (basically 2 inches…hard to get accurate with a tape while they are mounted) on 3 of them from the flat bottom to the tine end. Apparently I also have a R3L, and it was 2-5/8” long.

At 1-9/16”, I am guessing that you have the 556 R3 and not the 762 R3 with 1/2X28 threads. I think that’s why we are seeing a difference in measurements between ours. Even the picture of the two on the site make them look different and the top ridge between the two look different as well (see below). I would bet that the 762 R3 is what you need, especially since you have the 762 Razor can. The 762 R3 should get you at least 3/8” more length per my measurements compared to yours.

I am also assuming the 762 3 port brake version is as long or longer than the 762 R3 since it has the note about making a 14.5 reach 16. Hopefully, I’ll hear back from them soon.

View attachment 590289
Click to expand...
My apologies. Tired and typo’d. The R3 I have is 1 15/16” as well.

I have the R3 762 flash hider on two guns, which are what came with the 762 Razors. I have the 556 R3 on two 556 guns, and the cans work fine with them. The issue is that I need a longer version of the R3 for one gun to be 16”. That gun is not an SBR and I do not wish for it to be. I need a longer R3, which they make for 762 but do not for 556 threaded as 1/2x28.

So, for this gun I will need to go to a different manufacturer altogether who has a longer mount, or a longer barrel to avoid the two tax scenario.
 
hughesprecision.com

Barrel EXTENSION, Threaded Barrel Adapter 1/2-28 to 1/2-28 TPI

This barrel extension fits 1/2"-28 threaded barrels, when installed extends the barrel length by .7" (just under 3/4 of an inch) to get that little extra length you need for some suppressors and devises to clear the hand guard. Threaded Barrel Adapter is manufactured from 4140 chromoloy steel...
hughesprecision.com hughesprecision.com
 
NiceOldDouble said:
My apologies. Tired and typo’d. The R3 I have is 1 15/16” as well.

I have the R3 762 flash hider on two guns, which are what came with the 762 Razors. I have the 556 R3 on two 556 guns, and the cans work fine with them. The issue is that I need a longer version of the R3 for one gun to be 16”. That gun is not an SBR and I do not wish for it to be. I need a longer R3, which they make for 762 but do not for 556 threaded as 1/2x28.

So, for this gun I will need to go to a different manufacturer altogether who has a longer mount, or a longer barrel to avoid the two tax scenario.
Click to expand...
Ok, makes sense now! Hopefully, I’ll hear back from Rugged on the length of the 3 port brake and that may solve the issue for you.

Looks like @BigWaylon already suggested another possibility to get the length needed. I‘ve had to use the same type of extension to adapt thread pitch on one barrel and it has worked fine.
 
Ordered the extension. I’ll be welding it in place, then turning down the OD on the lathe, pin and welding the R3 in place, and reblue the barrel. Should all work out fine.

Thanks for enduring a newb.
 
Just to wrap up this thread…TJ, with Rugged responded this morning with the following:

Length of the 7.62 3 port muzzle brake is 2.16 inches, which is 2-5/32”

Length of the 7.62 R3L (just wanted for reference) is 2.61 inches, which is a little over 2-9/16”

Length of the 7.62 R3 (from our measurements above) is 1-15/16”

All of these, per the website pages of each, should get a true 14.5 inch barrel over 16 inches.

On the other question around options to get a 14.5 inch 5.56 barrel to 16 inches using a 5.56 Razor can…

I verified (twice) with TJ that the 7.62 R3 flash hider will work with the 5.56 Rugged can, so you do have an option to get a 14.5 barrel to 16 inches while being able to use a 5.56 Rugged can. I would suggest that you Reach out to Rugged yourself to confirm before going this route!

My question…”Will the 7.62 R3 flash hider in 1/2x28 threading work with a 5.56 Razor can on a 5.56 caliber rifle?”

TJ’s response…”Yes you can use the R3 1/2x28 flash hider with the razor 556”

My clarification question…”I just want to clarify on question 3…I was specifically asking about using the 7.62 version of the R3 with 1/2X28 threading with the 5.56 Razor can. Are these compatible? I know the 5.56 R3 works with the 5.56 Razor, but I was asking about the 7.62 R3 in my question.”

TJ’s 2nd response…”Yes, that is correct. you can“
 
Last edited:
willpgn said:
Length of the 7.62 R3 (from our measurements above) is 1-15/16”

All of these, per the website pages of each, should get a true 14.5 inch barrel over 16 inches.
Click to expand...
Here’s my question…

How does a 1-15/16” QD mount get a 14.5” barrel to 16”? That seems like short barrel threads.
 
BigWaylon said:
Here’s my question…

How does a 1-15/16” QD mount get a 14.5” barrel to 16”? That seems like short barrel threads.
Click to expand...
I have .615” of barrel threads on a 14 5/8” barrel. Without the forbidden crush washer, using the 1 15/16” long R3 1/2”-28 flash hider, I am short 1/16” of 16”.

So, I am going with the recommended extension above, or switching to the longer 3 port brake, which is quite a bit longer than the flash hider.
 
You must log in or register to reply here.
Back
Top Bottom