Modern Sporting Rifle Evolution
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rx7kevin

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Reply with quote  #1 
I finally assembled my first 277 WLV pistol. I waited a few months (impatiently) for the 8.5" barrels to become available. Mark and crew were quite responsive to my inquires to the delivery date.


The suppressor is a Griffin Armament Paladin 30 cal and the muzzle device is the taper mount minimalist brake. The muzzle device uses shims instead of crush washers. You add shims as needed to time the ports in the correct position (the griffin logo faces down at the 6 o'clock position).

Hand tight the griffin logo was past the 6 o'clock (proper) position at the 7 o'clock. So I had to add enough shims to clock it 320 degrees to get it to the 5 o'clock (ish) for correct torque. The problem here was that with so many washers, they were getting crushed.

IMG_2085.jpg 

I also wanted to confirm barrel alignment, so I ordered a Surefire/Geissele 6.8 alignment rod (on sale at Midwayusa)

After some research I found Precision Armaments Accu-washer [https://precisionarmament.com/product/accu-washer-system] , which is a one piece washer. The package comes with 28 various washers. It gets great reviews and I figured it would help using a single washer instead of multiple very thin washers. I picked up the packaged from Wing Tactical who has been reliable for other orders.

A few days later the new washers arrive and I find the correct washer to get the timing correct. Torque is just over 35#. I checked the muzzle alignment with the rod and it looks good, but hard to tell with a 30 cal muzzle device and a 277 barrel.

Adding the suppressor and it was evident there is some problem with the alignment. It is not touching and there is some clearance.

IMG_2196.jpg 

I rechecked the alignment on my 556 rifle and it is perfectly center with the suppressor attached.

I come here to ask you option and help. Is this safe or are there other things to check?


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bbbrownfield

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Reply with quote  #2 
Did the rod line up on center with the original washers? If so check all mating surfaces for square and check for some little bit of crap that could be the cause of it all. I can't say if it's safe, but it sure isn't right...
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MDWS

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Reply with quote  #3 
If you are still concerned after checking it again we will happily take it back and recut the threads or replace it.




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Bajabusdoc

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Reply with quote  #4 
mark side closest to rod, then remove and re torque without washers see if threads on suppressor will lean at a different direction (clocked) or if barrel threads will lean the same direction. to check washer untorque spin washer 180 deg and retorque..... 
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Brunosplace

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Reply with quote  #5 
Could you put the mount on a known good barrel? There were some blem paladin mounts that were sold as "not for suppressor use.' You may have ended up with a defective one.
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rx7kevin

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Reply with quote  #6 
Hi Bruno,

That is interesting. I will check, but the current muzzle device shipped with the suppressor 😀. I’ll try and reach out to Griffin. Any idea or links on how to identify these?

On my 556 rifles I have the flash comp taper mounts. Both are aligned perfectly.

Thanks for the feedback.
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Brunosplace

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Reply with quote  #7 
I don't know if they had any identifiers on them. A couple people on http://form1suppressor.boards.net had ended up with bad ones about a year or so ago. Then Griffin had a sale (Black Friday 2017 timeframe if I remember correctly) on their website of the blems. I would guess it was a good sized batch of them that were off.
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Moleman

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Reply with quote  #8 
I've had a similar issue with the timing washers.  Occasionally they seem to want to slide around so I just started making a threaded washer .080"-.090" thick from part of the barrel scrap.  The threads let me screw it on a threaded arbor in a lathe and trim it to time the brake and also help center the washer snugly over the relief cut area which doesn't have any threads. A standard washer can move around whatever the difference is between the ID of the washer and the OD of the relief cut.   Kind of need a lathe to make one and trim it unit it times.  Using the TPI and degrees the timing is off you can usually use math to figure out how much to trim off. 
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rx7kevin

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Reply with quote  #9 
I pulled off the muzzle device this morning and thoroughly cleaned all the threads on the barrel and in the md. I then installed with without the washer and torqued it down.

It is not timed but checking the alignment, the alignment rod is favoring the exact same spot. Tried it with a different washer size with same result. Based on everyone's feedback, this is pointing to the threads not being concentric to the bore or the shoulder is off.

There appears to be a small "step" on the shoulder.  This barrel was also cera-coated, so there is potential some overspray could be causing an issue?? My phone camera cant get a clear pic of this.

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