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Posted: 6/7/2003 4:41:22 PM EDT
[#1]
I have had some problems with my PRI SPR tube - before I put my ARMS #35 QD mount on - I had to dremel the colla ra tad and now it cannot loosen off for the ARMS #35 is in a channel through it.
Now I had a KAC FF RAS for over two years and never had any toubles and It got a much tougher work out. My guess is there is a reason the US Army went with the ARMS SPR Rail ont he PRI tubed guns... |
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Posted: 6/7/2003 4:50:41 PM EDT
[#2]
[b]Now I had a KAC FF RAS for over two years and never had any toubles and It got a much tougher work out.[/b]
I guess that its advantage lies in the two index pins that hold the FF RAS in place in relation to the barrel nut. PRI should have gone this route. [b]My guess is there is a reason the US Army went with the ARMS SPR Rail ont he PRI tubed guns.[/b] Exactly the same reason for the ARMS #38 EX Mod L for the KAC M4 RAS. |
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Posted: 6/7/2003 4:54:59 PM EDT
[#3]
If I recall, the PRI tube does have two indexing pins that keep it straight up in relation to the barrel nut?
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Posted: 6/7/2003 6:04:50 PM EDT
[#4]
Quoted: If I recall, the PRI tube does have two indexing pins that keep it straight up in relation to the barrel nut? I was not sure about that since Wes at MSTN had installed mine and the sleeve nut is on very tight and I do have the ARMS SPR rail installed. Maybe blue Loctite would work. It is worth a try. |
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Posted: 6/7/2003 6:16:17 PM EDT
[#5]
Try teflon tape on the threads before you screw it down. It works great on muzzle brakes and other threaded items that need to stay put and exposed to heat. It is an old trick that I used to use on header bolts that works great on firearms.
IDHunt |
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Posted: 6/7/2003 6:23:21 PM EDT
[#6]
Exactly, he already knows about the Teflon tape used to assemble an upper my friend sold him. Keeps everything from seizing up and keeps the threaded parts snug without vibrating loose.
Does the SPR rail touch the forend outer collar at all to keep it from turning? |
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Posted: 6/7/2003 9:52:20 PM EDT
[#7]
Quoted: Exactly, he already knows about the Teflon tape used to assemble an upper my friend sold him. Keeps everything from seizing up and keeps the threaded parts snug without vibrating loose. Does the SPR rail touch the forend outer collar at all to keep it from turning? The ARMS SPR rail slides over and is screwed into the top rail of the PRI tube and there are notches underneath the rail that fit snugly over the collar so nothing is going to move it. |
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Posted: 6/7/2003 10:00:16 PM EDT
[#8]
Quoted: The ARMS SPR rail slides over and is screwed into the top rail of the PRI tube and there are notches underneath the rail that fit snugly over the collar so nothing is going to move it. So, the SPR rail is more of a barrier than a physical connection to prevent the collar from loosening... [thinking] |
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Posted: 6/8/2003 5:44:20 AM EDT
[#9]
THE P.R.I. FOREND USES TWO INDEXING PINS, JUST LIKE THE KNIGHT'S FORENDS.
THE "COLLAR"? I GUESS YOU'RE REFERRING TO WHAT I CALL THE "HANDGUARD NUT", THAT TIGHTENS THE HANDGUARD TUBE TO THE BARREL NUT. P.R.I. MAKES A SPECIAL SPANNER WRENCH FOR TIGHTENING THE COLLAR/HANDGUARD NUT. A STRAP WRENCH WILL DO, USUALLY, BUT WITH THE ARMS #38 SPR RAIL IN PLACE, YOU CAN'T USE A STRAP WRENCH. EITHER THE TEFLON TAPE OR A DROP OR TWO OF BLUE LOCKTITE OUGHT TO SOLVE THE LOOSENING PROBLEM, I WOULD THINK. WES GRANT [URL]MSTN.BIZ[/URL] |
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Posted: 6/8/2003 10:34:08 AM EDT
[#10]
Another problem brought to my attention and I quote "PRI tubes are not centred on the barrel either if you look straight down the bore".
I'm confused: it takes two people who regularly work on guns to line up a barrel nut that easily spins on and the PRI tube isn't straight with the barrel. [slap] I have no problems putting my uppers together and I only have hobbyist tools! [ROFL2] |
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