1911Tuner
Moderator Emeritus
Well...not bein' long on patience, I got my tired old patoot outta bed early and
made a short trek up to a little impromptu range not far from here to see if the relinking solved the problem. I've only got about 25 yards there, but
figured that if it strung at 50, it would string a little at 25.
The vertical stringing went away...as near as I can tell...and the groups are
nice and symmetrical. The point of impact is a little higher now...no doubt due to the barrel starting tounlock a little earlier...but no more than an inch-point-five.
The frame to slide fit is still tight, as is the vertical barrel lockup. Close examination of the locking lugs shows no linkdown timing damage, so everything is still good to go.
Curiously enough, the link that I replaced the original with was a Wilson #2,
which is .005 inch shorter than the "standard" .278 link...and about the
same amount that I lowered the rails. The #2 link was a near-perfect match for the lower lug dimensions...and the barrel neither rides the link, nor does it lock on the link...so everything worked out nicely.
Measuring the holes in the link a bit more carefully revealed that the hole is
.211X.214 inch...longer than it is wide. I was hurried last night, and just did a quick-check with the caliper without measuring twice at 90 degrees. I had relieved the hole with a drill rod and some 600-grit paper by about .001 inch to get the slidestop pin onto the lug...so this would account for that amount of the elongation. The material was just barely visible above the lug, and the clearancing that was done was mostly polishing to match things up and get the pin bearing evenly all the way across both sides of the lug and the link.
It would have likely worn in eventually anyway, and could have been done with a little J&B on the pin and a couple hundred rounds...but I wanted everything to lock up right from Jump Street.
The small hole is a little oversized too, coming in at .157 inch...measured three times, just to be sure my eyes weren't lyin' to me. Not a major issue,
but fairly sloppy with a .154 diameter pin. I may ream the hole and press in a
.156 pin later on...just to see what effect it has on the grouping and/or POI.
I'm still mightily impressed with the barrel, and these are minor issues. The system is very good and just the ticket for a hobby smith who wants a well-fitted and accurate barrel upgrade.
made a short trek up to a little impromptu range not far from here to see if the relinking solved the problem. I've only got about 25 yards there, but
figured that if it strung at 50, it would string a little at 25.
The vertical stringing went away...as near as I can tell...and the groups are
nice and symmetrical. The point of impact is a little higher now...no doubt due to the barrel starting tounlock a little earlier...but no more than an inch-point-five.
The frame to slide fit is still tight, as is the vertical barrel lockup. Close examination of the locking lugs shows no linkdown timing damage, so everything is still good to go.
Curiously enough, the link that I replaced the original with was a Wilson #2,
which is .005 inch shorter than the "standard" .278 link...and about the
same amount that I lowered the rails. The #2 link was a near-perfect match for the lower lug dimensions...and the barrel neither rides the link, nor does it lock on the link...so everything worked out nicely.
Measuring the holes in the link a bit more carefully revealed that the hole is
.211X.214 inch...longer than it is wide. I was hurried last night, and just did a quick-check with the caliper without measuring twice at 90 degrees. I had relieved the hole with a drill rod and some 600-grit paper by about .001 inch to get the slidestop pin onto the lug...so this would account for that amount of the elongation. The material was just barely visible above the lug, and the clearancing that was done was mostly polishing to match things up and get the pin bearing evenly all the way across both sides of the lug and the link.
It would have likely worn in eventually anyway, and could have been done with a little J&B on the pin and a couple hundred rounds...but I wanted everything to lock up right from Jump Street.
The small hole is a little oversized too, coming in at .157 inch...measured three times, just to be sure my eyes weren't lyin' to me. Not a major issue,
but fairly sloppy with a .154 diameter pin. I may ream the hole and press in a
.156 pin later on...just to see what effect it has on the grouping and/or POI.
I'm still mightily impressed with the barrel, and these are minor issues. The system is very good and just the ticket for a hobby smith who wants a well-fitted and accurate barrel upgrade.