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Old December 16, 2017, 17:49   #1
NZ L1A1 Collector
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Some L1A1 Fixtures courtesy of y18376

y18376 wanted me to post these photos of some fixtures he "rescued from an older armourer".

I think it was more of a case he wanted to torment me with them

Can you guess what they were used for?


SHOULDER LOCKING FIXTURE, used to install new locking shoulders



BODY AND BARREL ALIGNMENT FIXTURE, used to check that the new barrel is fitted correctly and is not canted, the 'gauge' is the small angled block on the bottom right side, its to slide between the foresight ears



SIGHT ALIGNMENT FIXTURE, used to check the alignment of the backsight with the foresight, used after replacing the barrel



BREECHING and UN-BREECHING FIXTURE, used to remove and install L1A1 barrels



BREECHING and UN-BREECHING FIXTURE, used to remove and install L1A1 barrels or in this case for the larger diameter L2A1 Barrels
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Last edited by NZ L1A1 Collector; December 19, 2017 at 16:03. Reason: descriptions added
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Old December 16, 2017, 18:07   #2
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Well I could.... But I will hold off for now...
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Old December 16, 2017, 18:32   #3
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I don’t have to guess. How much?
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Old December 17, 2017, 03:43   #4
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Quote:
Originally Posted by NZ L1A1 Collector View Post
y18376 wanted me to post these photos of some fixtures he "rescued from an older armourer".

I think it was more of a case he wanted to torment me with them

Can you guess what they were used for?










There are actually two separate samples of the of the lower item as shown by the different detail in the two photo's. provided.
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Old December 17, 2017, 07:42   #5
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Well,

Maybe one of those contraptions is for pressing on gas blocks? Other than that it has to be either the locking shoulder/leg or the retainer pin for the frame lock or possibly a rear sight. Cant think of anything else pressed on.

Doesn't look like anything for rivets.

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Old December 17, 2017, 09:28   #6
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It's a "Totally Cool L1A1 Ass'y Tool" aka, TCLAT.


Could likely also be a TCFAT.
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Old December 17, 2017, 10:05   #7
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Install locking shoulders and set head space?
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Old December 17, 2017, 11:19   #8
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The last picture, the one with the hydraulic press, appears to be a breeching and unbreeching the barrel fixture.
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Old December 17, 2017, 11:56   #9
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I agree...the first picture does appear to be a locking shoulder assembly fixture.
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Old December 17, 2017, 14:23   #10
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Quote:
Originally Posted by y18376 View Post
There are actually two separate samples of the of the lower item as shown by the different detail in the two photo's. provided.
The second fixture added to the photos
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Old December 17, 2017, 14:45   #11
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Do you want me to post the diagrams demonstrating how to use them?
Or you probably have them already.
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Old December 17, 2017, 15:21   #12
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Quote:
Originally Posted by gunplumber View Post
Do you want me to post the diagrams demonstrating how to use them?
Or you probably have them already.
To use them is a walk down memory lane.
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Old December 17, 2017, 15:30   #13
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Quote:
The second fixture added to the photos
Ones for unbreeching and the other for breeching?
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Old December 17, 2017, 18:09   #14
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Quote:
Originally Posted by Falcon View Post
Ones for unbreeching and the other for breeching?
Apparently the second was modified to accept the L2 barrel shank.
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Old December 17, 2017, 19:05   #15
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Quote:
Do you want me to post the diagrams demonstrating how to use them?
Or you probably have them already.
GP, I would like to see how they are used.
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Old December 18, 2017, 18:50   #17
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Thanks Mark, that fills in the blanks and lets me understand it all!
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Old December 19, 2017, 08:57   #18
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Yes thanks for detailed pics. of this in action.
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Old December 19, 2017, 19:21   #20
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Symmetry fixture - complete overkill - can be accomplished by a hand-held chisel block - and then used to straighten the wings if bent, which the sliding block fixture cannot.

http://www.arizonaresponsesystems.co...ch-reme-16.jpg

Update: I was thinking this was for the symmetry of the front sight wings. On further thought, it seems that it is only for the front sight blade. Because people are incapable of looking at one and discerning if it is bent?

The one with the long rail still has me curious. I vaguely remember seeing it, but a quick review of my notes and I'm not finding it. I suspect from the long rail that it is for alignment of some type. I thought perhaps rear sight to front sight. But the hole on the left and the rod looks about hinge-pin size. Makes me think it is for a barreled receiver only, which then makes me wonder what is being aligned. The spigot on the bottom R of center looks like it is for a gas block, but then it would need be upside down in the fixture, at which point the hinge hole would not align on the left.

Also the contraption with the gears has me curious. Looks maybe for engraving. So I'm going to give up on this one. Please reveal!
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Last edited by gunplumber; December 20, 2017 at 10:27.
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Old December 20, 2017, 08:27   #21
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Interesting. So they used a hydraulic ram to set the receiver on to the barrel. I seem to remember seeing pics of metric rifles being barreled where they just used What looked like a receiver wrench with a bar off to each side for the use of two hands to spin it on and off.
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Old December 20, 2017, 10:44   #22
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What I also find very interesting is that they used just the barrel flats. I knew the flats were there for a reason, but I always pictured a barrel vise that also engaged the flats, not something that just engaged the flats.
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Old December 20, 2017, 15:02   #23
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Update: I was thinking this was for the symmetry of the front sight wings. On further thought, it seems that it is only for the front sight blade. Because people are incapable of looking at one and discerning if it is bent?

The one with the long rail still has me curious. I vaguely remember seeing it, but a quick review of my notes and I'm not finding it. I suspect from the long rail that it is for alignment of some type. I thought perhaps rear sight to front sight. But the hole on the left and the rod looks about hinge-pin size. Makes me think it is for a barreled receiver only, which then makes me wonder what is being aligned. The spigot on the bottom R of center looks like it is for a gas block, but then it would need be upside down in the fixture, at which point the hinge hole would not align on the left.

Also the contraption with the gears has me curious. Looks maybe for engraving. So I'm going to give up on this one. Please reveal![/QUOTE]

1. The symmetry fixture is to confirm alignment of bare Body/Barrel assy after breeching.
Fit a foresight to the bare body/barrel.
Slide the sliding gauge piece towards the lump.
Body/barrel assy upside down on fixture with Body on lump and barrel on the saddle then clamp body.
Slide gauge piece towards foresight blade. Foresight should enter machined slot on sliding gauge piece when Body/Barrel are aligned.

2. The sight alignment fixture accepts a built up rifle with the spigot engaging the chamber through the magazine well.
The rod fits in the hole to secure the rifle in the fixture saddle.
The slider is adjusted to align with the foresight then is moved back to engage the rear sight hole or rear sight is adjusted to allow entry. The rear sight should have still have adjustment left and right otherwise the bare Body/Barrel is not correctly aligned as in 1.

Not sure about the "contraption with gears " you refer to.
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Old December 20, 2017, 15:31   #24
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Quote:
Originally Posted by y18376 View Post
Not sure about the "contraption with gears " you refer to.
Sorry, not gears, meant the threaded axle with knurled knob, which appears to be for vertical adjustment, and the other knurled knob on the left side of it. Is this to raise and lower a pointer to introduce to the rear sight blade?

But yeah - spigot in chamber, now makes sense.

I do wonder, why the bother with dial indicator on the breaching ram, if they don't trust it enough to use without testing again in the alignment slide.

I do something similar on a mill table with a pointer for AK sights. Align on the rear sight notch, then run the table to the gas block, and then the front sight, for mechanical zero.
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Old December 21, 2017, 03:18   #25
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Quote:
Originally Posted by gunplumber View Post
Sorry, not gears, meant the threaded axle with knurled knob, which appears to be for vertical adjustment, and the other knurled knob on the left side of it. Is this to raise and lower a pointer to introduce to the rear sight blade?

But yeah - spigot in chamber, now makes sense.

I do wonder, why the bother with dial indicator on the breaching ram, if they don't trust it enough to use without testing again in the alignment slide.

I do something similar on a mill table with a pointer for AK sights. Align on the rear sight notch, then run the table to the gas block, and then the front sight, for mechanical zero.
.

Yes, the assy is capable of being aligned to the foresight post prior to slide back to engage rear sight post hole, the pointer has a blade at front end and small pin on rear face, then adjust rear sight as explained in previous. The base has a slot to allow the grip to protrude through. The feet at each end ensure the grip is not fouled

Dial gauge allows body to be aligned to same zero point after the dial gauge has been zeroed to "setting piece" also in the photo. In conjunction with the pressure gauge reading, the operator has a visual confirmation the breeching is in the zone. It is simply a system of check and double check in a repeatable way. Keep in mind, particularly in a SAF or even 4th line repair level, not everybody is an armourer.

Yes the mill table set up is an engineering solution to the same requirement but not everybody thinks of that.
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