Noticeable difference between standard and short m305 barrel?

btw - M305, not M395
have only shot the full length, but have heard complaints about sighting in shorties. Probably not a huge difference otherwise
 
The only thing you'll notice is a marked increase in muzzle blast and noise with a short barrel. Velocity will be less as well, but you won't see that.
 
Actually, a couple things you'll notice,

-Your sights will no longer have correct range values, the range numbers will no longer exactly apply due to decreased velocity from the 18 1/2". I shoot my irons far, was just doing 500 yards a couple weeks ago, and it would really start to matter out there and beyond. At 100 yards, 200 yards? Won't matter.

-The 18 1/2" guns have had markedly lower quality compared to earlier 22" guns. I imagine current 22" production is equally bad, but the barrel blow ups reported here have been 18 1/2", I think the failed bolts were too no?
 
Duke878 said:
Like the title says, is there much of a noticeable difference?

Thanks!
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about a .5 LB of steel you don't have to hold up.....


I can get speeds equal to a 22" barrel out of a 18.5, just takes an extra grain of powder lol.

and yes Ardent,

Its the late 2011/2012/2013 shorties that seem to have poor manufacturing standards and the most kaboom issues.
 
The shorter barrel is nice when you're pushing through the bush, and it makes it slightly easier to transport and store. Also as Ardent said the rear sight click values will be off, but not by very much. Quoting some work done by a guy with a Springfield 18" scout:

We know that the 22" M14 rear sight moves 1 MOA per click so we can deduce the actual rear sight movement as so...
Sight Radius x Impact Movement / Target Distance = Sight Movement

26.75 x 1.047 / 3937.01 = .007113
Notice the distance is in 100 Meters converted to Inches, Remember the M14 is regulated in Meters.
So each click of the rear sight moves the sight .007113 inches

Using the same formula for the 18" rifle...
22.75 x 1.047 /3600 = .006616"
Notice I used Yards for the M1a, The 18" rifle rear sight would need to move .06616" per click in order to move 1 MOA.
This isnt going to happen, we must use the .007113" as it is the built in mechanical movement of the rear sight. So how much will each click move impact on the 18" rifle?

.007113 x 3600 / 22.75 = X X = 1.126" or 1.178 MOA

The rear sight on an 18" M1a will move impact 1.178 MOA per click

Using the chronographed velocity of M80 ball from my 18" scout the rear sight indications are surprisingly close to actual values.
The normal 300M tick or "200M plus 3 clicks" now corresponds to 314yard or 287meters
The normal 400m tick is now 439yard or 401meters
The normal 500m tick is now 545yard or 498meters
Click to expand...
 
mattf87 said:
What are the failed bolt issues that they have had?
Click to expand...

There was a thread a few weeks back where someone had one of the lugs give out. I haven't heard of any other recent incidents regarding the bolts other than this. The cause was never determined, but it was suspected to be lack of hardness in the metal, reloaded ammo, or both. There was a similar incident with a springfield where both of the lugs gave out and bolt hardness was the issue I believe, so its not a Norinco exclusive defect. I own two, and don't worry about either having issues.
 
Silent8Strike said:
There was a thread a few weeks back where someone had one of the lugs give out. I haven't heard of any other recent incidents regarding the bolts other than this. The cause was never determined, but it was suspected to be lack of hardness in the metal, reloaded ammo, or both. There was a similar incident with a springfield where both of the lugs gave out and bolt hardness was the issue I believe, so its not a Norinco exclusive defect. I own two, and don't worry about either having issues.
Click to expand...

I know of three, one first hand, the other two were both mentioned in that thread. One, the bolt blew and pieces cut the guy's scalp (lucky), the other in the same thread was reported by a a guy who was shooting one and the bolt failed the same way. Then there's the barrels splitting in two, a couple cases reported here and likely more not on CGN given the dealer's new proofing procedure. Enough to creep me out.
 
I should have also mentioned I was selling a Norc bolt I'd dug out of the basement, brand new, from when I built on Norcs. I decided to hit it with a automatic centre punch for peace of mind before I sold it to anyone, and it took a big dent like mild steel, I tried one of the TRWs I have and it barely made a visible mark. Cutting torch became its fate.

I'd lapped a Norc bolt in the past when fitting a new barrel and they also lap in far too easily compared to USGI, indicating extreme softness. Creepy part is this isn't all bolts, so very poor quality control, no thanks.
 
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