1911Tuner
Moderator Emeritus
A continuation of this thread, due to the other one goin' to hellinahandbasket, gettin' a bit off-topic...and long in the tooth.
http://www.thehighroad.org/showthread.php?s=&threadid=99404
__________________
Jammer overnighted the top end to me...and all seems to be well.
Here's what I found:
The slide was in-spec, but on the short side of tolerance from the firing pin slot centerline to the breechface, causing the extractor to sit slightly forward.
The extractors...both of'em...were on the long side of tolerance from the
stop slot to the backside of the hook, contributing to a tolerance stackup issue in relation to the extractor groove of the cartridge. Don't know if this has been corrected by the vendor in a different lot.
Both firing pin stops in the extractors width was out of spec, which allowed
.005 inch of fore and aft play in the channel. I replaced his extractor with a used Wilson part designed for a Series 80 Colt...
The extractor channel was slightly angled to the right, making it necessary
to reduce the front pad to just under .125 inch in order to obtain correct tension on the case rim during feeding...and as a result, more "bend' was required in order to maintain tension throughout the cycle. This made nearly total reduction of the right side of the center pad in order to prevent hard binding when the extractor cams open to receive the rim.
There was slight clocking of the extractor noted, and not having an oversized firing pin stop on hand...I used a punch to raise a dimple on the side of the stop to put it into contact with the extractor. This is a field expedient repair, and an oversized stop should be correctly fitted...though the expedient fix will hold up unless the stop is removed from the slide repeatedly over a period of time.
The barrel fit was good, and the chamber slightly short, making perfect headspace on an .895 GO gauge. Not necessarily a bad thing, but it will tend to make the gun less reliable with case lead bullets with a shoulder that provides a full-diameter driving band unless seated flush with the case mouth.
The slide walked onto an old 1918 Colt frame, and all timing functions are correct. I'll test-fire the top end on this frame and see what we have.
All indications that the problem issolved, as long as the extractor isn't forced to snap over the rim during a push-feed, which is most often a magazine issue during the feeding of the last round.
If everything checks out, Jammer should have hhis pistol up and runnin' no later than Saturday.
Drop-In parts sometimes don't...
Cheers!
Tuner
http://www.thehighroad.org/showthread.php?s=&threadid=99404
__________________
Jammer overnighted the top end to me...and all seems to be well.
Here's what I found:
The slide was in-spec, but on the short side of tolerance from the firing pin slot centerline to the breechface, causing the extractor to sit slightly forward.
The extractors...both of'em...were on the long side of tolerance from the
stop slot to the backside of the hook, contributing to a tolerance stackup issue in relation to the extractor groove of the cartridge. Don't know if this has been corrected by the vendor in a different lot.
Both firing pin stops in the extractors width was out of spec, which allowed
.005 inch of fore and aft play in the channel. I replaced his extractor with a used Wilson part designed for a Series 80 Colt...
The extractor channel was slightly angled to the right, making it necessary
to reduce the front pad to just under .125 inch in order to obtain correct tension on the case rim during feeding...and as a result, more "bend' was required in order to maintain tension throughout the cycle. This made nearly total reduction of the right side of the center pad in order to prevent hard binding when the extractor cams open to receive the rim.
There was slight clocking of the extractor noted, and not having an oversized firing pin stop on hand...I used a punch to raise a dimple on the side of the stop to put it into contact with the extractor. This is a field expedient repair, and an oversized stop should be correctly fitted...though the expedient fix will hold up unless the stop is removed from the slide repeatedly over a period of time.
The barrel fit was good, and the chamber slightly short, making perfect headspace on an .895 GO gauge. Not necessarily a bad thing, but it will tend to make the gun less reliable with case lead bullets with a shoulder that provides a full-diameter driving band unless seated flush with the case mouth.
The slide walked onto an old 1918 Colt frame, and all timing functions are correct. I'll test-fire the top end on this frame and see what we have.
All indications that the problem issolved, as long as the extractor isn't forced to snap over the rim during a push-feed, which is most often a magazine issue during the feeding of the last round.
If everything checks out, Jammer should have hhis pistol up and runnin' no later than Saturday.
Drop-In parts sometimes don't...
Cheers!
Tuner