Where and How to Measure Tightness

[Bearbuck]

I got my new Fusion match barrel bushing in today. When I got it home and measured it, it is the same dimentions as the factory one, therefore not tightening up the way I wanted. No need for a wrench on this one either. I can turn it with my little finger.
When the slide is all the forward (As in the position to fire", The bushing to barrel is tight, when the slide is locked back however, I can put my little finger in the end of the bore and wiggle it. It has some play and is a little loose. So , how do you decide if its tight enough or not, In the ready postion or with the slide locked back? Thank you

Bearbuck

[Jolly Rogers]

The bushing loosens as the slide cycles during recoil. The barrel is a smaller diameter (usually) about .5" back from the muzzle. The bushing should be tightest with the barrel in battery and fully locked up in the slide. The best way to determine how well the bushing and barrel fit is using inside and outside micrometers. Calipers ,dial or vernier,can be used if one is very careful to get consistent measurements.
That said, the fit of your replacement bushing in the slide could have been tighter. I fit one and have to use a wrench to remove it comfortably. If you can remove it with light finger pressure it may not be as accurate as possible.
Hope that helps.
Joe

[Bearbuck]

need more knowledge fellas

[pa_guns]

Hi

There are two "fits" on the bushing.

The first fit is bushing to slide. This can be pretty tight. On a well fit bushing, there should be no motion of the bushing relative to the slide. You can get a bushing to fit the slide and rotate freely, but it's not easy. Most often you see a barrel wrench used on a bushing that is tight in this respect.

The second fit is bushing to barrel. Practically, you can't get this one super tight. The only thing that counts is when the slide is locked up in the "firing" position. Getting much below a 0.001" fit here is likely to lead to reliability issues.

A 0.001" fit should be good enough to give you 0.36" groups at 50 yards *if* it was the only source of error.

Bob