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Posted: 10/26/2004 12:03:11 PM EST
Link Posted: 10/26/2004 12:09:44 PM EST
hum... you should be fine w/ a FSP even it it flexes a little... i don't know...

is it left to right motion, up and down... or all directions?
Link Posted: 10/26/2004 12:17:31 PM EST
Link Posted: 10/26/2004 12:52:01 PM EST

Originally Posted By MP906:
Ok, this is really ticking me off. I just took it apart and put it back on, and it still flexes at the front a good 1/8" with only thumb pressure. I can move it up, down, and side to side. Even w/out the lower rail installed, the upper rail moves like this, so it has nothing to do w/ the seperate lower piece.

I cranked the 4 screws down properly.

I was planning on putting a rail mounted flip up front sight, but this rail is not going to cut it.

Heck, my buddies comparable $90 Yankee hill rail is rock solid.

Any ideas?




Are you sure it's the MRF flexing and not the barrel?

-Cap'n
Link Posted: 10/26/2004 1:14:18 PM EST
Link Posted: 10/26/2004 1:16:55 PM EST
Link Posted: 10/26/2004 2:08:54 PM EST
Link Posted: 10/26/2004 2:44:44 PM EST
Link Posted: 10/26/2004 2:54:13 PM EST
Yep, completely normal, and expected.

-Cap'n
Link Posted: 10/26/2004 2:59:25 PM EST

Originally Posted By MP906:
Thanks Captain, but what about that barrel flexing? Normal?



[best Charleton Heston voice]Thus God allowed man to invent the FF tube, so that slings and bipods would not affect accuracy by deflecting the barrel.[/best Charleton Heston voice]
Link Posted: 10/26/2004 3:45:22 PM EST
Movement of the barrel by 1/8" ... I wouldn't consider that normal. Ensure that your barrel is torqued to proper specs.

Link Posted: 10/26/2004 4:06:43 PM EST
Link Posted: 10/26/2004 4:08:06 PM EST
Link Posted: 10/26/2004 4:33:23 PM EST

Originally Posted By MP906:
Thanks Captain, but what about that barrel flexing? Normal?



That is exactly why free floaing the barrel improves accuracy. There is no stress placed on the barrel from the handguard.

Link Posted: 10/26/2004 4:43:37 PM EST
Link Posted: 10/26/2004 5:01:49 PM EST
My 20" setup does NOT move.

I really dont think its normal...given the design of the barrel and receiver, how the hell can the barrel move? There simply isnt anywhere near enough "slop" for that to happen...atleast that is what I thought.
Link Posted: 10/26/2004 5:21:42 PM EST
I just tried the same thing with my Troy MRF-M and does the same thing
Link Posted: 10/26/2004 5:22:16 PM EST
Leverage.
Link Posted: 10/26/2004 5:43:37 PM EST
Yep. My 16" RRA middy with SIR 58 flexes like that too.

-Hershey
Link Posted: 10/26/2004 5:44:05 PM EST
[Last Edit: 10/26/2004 5:56:23 PM EST by Wackypeacock]

Originally Posted By redsky383:
Movement of the barrel by 1/8" ... I wouldn't consider that normal. Ensure that your barrel is torqued to proper specs.

hr


Yes, depends on how much you force it.

I have an SR25 that i can force the barrel an easy 1/8-inch and the gun still shoots 3/4-inch MOA all day long. So yes, the barrel can flex that much.

wacjob
Link Posted: 10/26/2004 6:28:26 PM EST

Originally Posted By Wackypeacock:

Originally Posted By redsky383:
Movement of the barrel by 1/8" ... I wouldn't consider that normal. Ensure that your barrel is torqued to proper specs.




Yes, depends on how much you force it.

I have an SR25 that i can force the barrel an easy 1/8-inch and the gun still shoots 3/4-inch MOA all day long. So yes, the barrel can flex that much.

wacjob





It just doesnt seem right...
Link Posted: 10/26/2004 7:19:30 PM EST

Originally Posted By Marksman14:

Originally Posted By Wackypeacock:

Originally Posted By redsky383:
Movement of the barrel by 1/8" ... I wouldn't consider that normal. Ensure that your barrel is torqued to proper specs.

hr


Yes, depends on how much you force it.

I have an SR25 that i can force the barrel an easy 1/8-inch and the gun still shoots 3/4-inch MOA all day long. So yes, the barrel can flex that much.

wacjob



I agree, but if the a sword bends, so can a inch wide, 24-inch barrel.

It sounds strange, but that's reality.

wac



hock.gif

It just doesnt seem right...

Link Posted: 10/26/2004 7:32:10 PM EST
Link Posted: 10/26/2004 7:38:26 PM EST
Just tried my Bushmaster with a 16" M4 barrel mounted with an ARMS #50c SIR and it has a little movement too. First time that I've ever tried to move it. It makes sense though. As others are saying, the longer the barrel, the more leverage being applied to the barrel nut which is allowing the small amount of flexing that we are experiencing.
Link Posted: 10/26/2004 7:54:32 PM EST

Originally Posted By MP906:
So barrel flexion is ok and "normal", but not all barrels will flex.

Is that the consensus?



Well, I'm no expert, but most barrels flex, to a point, unless it three inches wide barrel, that's 16-inches long.

I have a couple of bull-barrel bolt-guns and the all flex. Metal isn't that rigid...

wac
Link Posted: 10/26/2004 9:58:27 PM EST
I just finished putting a DD12.0 on my M4 barrel, I swear it didn't flex. It didn't flex when I yanked on the YHM flip up either
Link Posted: 10/27/2004 1:59:09 AM EST
A barrel is just a steel tube with rifling, nothing more. ANY steel tube will flex if you put force on it, regardless of length or diameter. The shorter and thicker the tube and the smaller the force, the less the tube will flex, but there WILL be flexing in any event. It is perfectly normal and nothing to worry about.
Link Posted: 10/28/2004 9:59:09 PM EST
I can put my 4 fingers on the barrel in front of the FSB and my thumb on the bottom of my RAS II and squeeze, barely getting movement. Probably between 1/16 to 1/8" max.
Link Posted: 10/29/2004 5:36:27 PM EST
Who sells the TROY MRFL carbine rail the cheapest?
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