1911 Slide / Frame / Barrel fit


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JCF
December 15, 2006, 10:37 PM
Ok... I recently acquired a frankenstein 1911: Sistema Frame, colt slide, barrel of unknown parentage. I have had two different barrels in the gun, and in each case the slide overhangs the rear of the frame by apprx. 1/16th of an inch. The gun functions fine nonetheless. If I remove the recoil spring assembly and bushing, the slide lines up correctly, but the barrel cocks notably downward. Is this a problem? Should I be firing the gun in this state, or am I risking damage? I don't see any apparent damage at this point, but I have no idea how much the gun has been fired as-is.

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Iron bottom
December 16, 2006, 07:58 AM
Just a WAG. Sounds like something is keeping that pistol from going completely into battery. I would find the problem before firing anymore. I would look at the bushing/barrel fit first and check for barrel springing. Best advice is to wait for Tuner to reply.

HSMITH
December 16, 2006, 08:57 AM
As long as the barrel is locking up right and timing is good the overhang isn't a problem at all. Pretty common on full custom builds actually, the cure is to mill/grind/file the back of the slide to match the back of the frame.

Normally it is less than a 1/16th but a 1/16th isn't all that much. .0625" to be exact....

Timing test can be found on the Schuemann barrels website, and it is pretty easy to do with his instructions.

1911Tuner
December 16, 2006, 08:59 AM
Howdy guys and welcome aboard.

The overhang could be caused by one of several things, or a combination of any. The possibilities are:

Barrel/slide lug dimensional issues.
Lower barrel lug located too far forward relative to slidestop pinhole location.
Slidestop pinhole location.
Lower barrel lug feet thickness, or lug height relative to slidestop pin location.
Overlength barrel hood.


The possible issues noted could be caused by one or more involved parts out of spec...or tolerance stacking by two or more of the parts/areas mentioned...in which each individual part is within spec, but the allowable tolerances in the assembly threw the sub-assembly out of spec.

It could also be a simple cosmetic issue. If...when the pistol is fully assembled...the disconnect will reset correctly and allow the hammer to fall when the trigger is pulled...it's probably cosmetic. During the manufacturing process, the older pistols were often finished at the rear of the frame and slide to correct any slight mismatch as needed. Of course, if they were more than just a bit out of alignment, it indicated that something was wrong inside.

With the gun assembled, engage the thumb safety and look to see if it's well-centered in its triangle-shaped notch...and of course...to see if the hammer will fall when the trigger is pulled. If these two things are noted, it's cosmetic. If not, then the barrel fit will need attention...probably in the lower lug feet...or the barrel will have to be replaced.

JCF
December 16, 2006, 07:42 PM
Checked the timing as per several sources; checks out fine. Safety is appropriately oriented to slide. Looks like a cosmetic issue.

Appreciate the help.

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