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SA Unitized GC, pics

This is a discussion on SA Unitized GC, pics within the Accuracy forums, part of the M14 M1A Forum category; Arrived yesterday. Just wanted to offer a close up look to anyone thinking about one....


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Old December 18th, 2016, 01:08 PM   #1
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SA Unitized GC, pics

Arrived yesterday.
Just wanted to offer a close up look to anyone thinking about one.
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Old December 18th, 2016, 01:10 PM   #2
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......
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Old December 18th, 2016, 01:20 PM   #3
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must have a new superglue

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Old December 18th, 2016, 01:55 PM   #4
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Not screwed, and not welded. What do they use?

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Old December 18th, 2016, 01:56 PM   #5
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Originally Posted by Roadkingtrax View Post
Not screwed, and not welded. What do they use?
Exactly.

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Old December 18th, 2016, 02:26 PM   #6
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That should be weld up top, at the barrel band. If it is, it is very clean.

The bottom hole of the front band is overbored so that it doesn't vibrate with the gas cylinder. It doesn't get welded, as that would compromise the overbore.

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Old December 18th, 2016, 02:30 PM   #7
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I see it, the entire top radius is welded.

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Old December 18th, 2016, 04:33 PM   #8
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Quote:
Originally Posted by Roadkingtrax View Post
I see it, the entire top radius is welded.
And all the metal has been ground off so there is no support for the top of the barrel shoulder. That means if you tighten up the GC with the gas lock the barrel will bend in the up position. Happened to me and my rifle was shooting over 20 inches high with the rear sight all the way down.

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Old December 18th, 2016, 04:40 PM   #9
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That is pie awful

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Old December 18th, 2016, 05:53 PM   #10
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I'll post range results.
Hopefully avoiding WalnutScout's experience.....
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Old December 18th, 2016, 06:00 PM   #11
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Quote:
Originally Posted by WalnutScout View Post
And all the metal has been ground off so there is no support for the top of the barrel shoulder. That means if you tighten up the GC with the gas lock the barrel will bend in the up position. Happened to me and my rifle was shooting over 20 inches high with the rear sight all the way down.
You don't tighten a unitized gas cylinder against the barrel shoulder. The idea is to have the gas lock pull the unit forward, away from the barrel shoulder. When you position the gas lock at 6 o'clock, you tap the unitized gas cylinder forward against the lock and insert the plug.

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Old December 18th, 2016, 06:05 PM   #12
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You don't tighten a unitized gas cylinder against the barrel shoulder. The idea is to have the gas lock pull the unit forward, away from the barrel shoulder. When you position the gas lock at 6 o'clock, you tap the unitized gas cylinder forward against the lock and insert the plug.
Does that mean that I do not use shims with this unitized GC?

I currently have two shims in place, with the stock GC, and the gas lock times at 530.

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Old December 18th, 2016, 06:15 PM   #13
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Quote:
Originally Posted by ColdWarPigGnR View Post
Does that mean that I do not use shims with this unitized GC?

I currently have two shims in place, with the stock GC, and the gas lock times at 530.
Correct, shims are used instead of a unitized gas cylinder and will torque your barrel upwards if the gas lock is anything more that finger tight.

A unitized gas cylinder, when done properly, connects the stock ferrule and the barrel with as little interference as possible.

Slide the unitized gas cylinder on the barrel and install the gas lock at 6 oclock. Tap the gas cylinder tail with a mallet to seat it forward against the lock. Insert the piston and plug. Torque the plug to about about 15-17 inch pounds.

If your stock has proper draw pressure, it is pulling the barrel downwards only at the point of the weld (rear band of gas cylinder). No other pressure from the barrel shoulder, gas cylinder tail, etc.

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Old December 18th, 2016, 06:43 PM   #14
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Quote:
Originally Posted by KurtC View Post
Correct, shims are used instead of a unitized gas cylinder and will torque your barrel upwards if the gas lock is anything more that finger tight.

A unitized gas cylinder, when done properly, connects the stock ferrule and the barrel with as little interference as possible.

Slide the unitized gas cylinder on the barrel and install the gas lock at 6 oclock. Tap the gas cylinder tail with a mallet to seat it forward against the lock. Insert the piston and plug. Torque the plug to about about 15-17 inch pounds.

If your stock has proper draw pressure, it is pulling the barrel downwards only at the point of the weld (rear band of gas cylinder). No other pressure from the barrel shoulder, gas cylinder tail, etc.
Is this also the opportunity to advance the gas system, as I've read in many a thread, regarding dwell time?

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Old December 18th, 2016, 07:35 PM   #15
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Quote:
Originally Posted by ColdWarPigGnR View Post
Is this also the opportunity to advance the gas system, as I've read in many a thread, regarding dwell time?
Check with folks like Lysander et al regarding modifying the dwell. The only way I know of to do that is to shorten the piston tail. That will require a re-heat or possibly nitride. You have to be careful that you are not letting forward movement of the oprod stop on the bolt roller or oprod guide.

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