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Barrel Bushing Recommendation

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5.5K views 35 replies 15 participants last post by  Magnumite  
#1 ·
I have a 70 Series Colt 45 ACP with a Kart barrel and bushing that shoots better than I can shoot it. I also have a Clark Rowland conversion for the same pistol that does not shoot well. It produces 3-4 inch groups at 25 yards. Investigating this I have noticed there is slop between the barrel bushing and the slide. I did some more group testing by putting bits of electrical tape on the outside of the bushing that temporarily got rid of the slop between the bushing and slide. Groups immediately dropped to under 2 inches which is satisfactory for my purposes with this gun. My plan is to buy another bushing. What bushing should I buy?

Compensator easily came off using a little heat.
 
#9 ·
I do not have a good caliper but have a good micrometer so the barrel diameter is no problem. I'm looking around in all my junk to find something I can use to get the slide ID, then measure it with my micrometer. Every time I measure with my caliper I come up with a different number.

I have a Kraft bushing that fits well and shoots well for when I shoot .45 ACP in it. Guess I could measure it and use that number. I also have a nice old outside divider, fine thread adjustable. I could heat the tips and bend them outward to get the ID, then measure with the micrometer.
 
#19 ·
Not being snarky because you obviously understand tools and measuring. But you may want to remeasure the slide ID. Those bores typically run closer to .700". The only slides I ever measured that big were Para Ordnances.

I guess the others will chime in if I just stepped in the doo-doo.
 
#16 ·
A well fitting guide rod plug will make up a great deal of slop between the Bushing OD and slide ID. I put the Bunker Arms radial bushing in my DW 1911. By the measurements, I had .0015 of slop between it and the slide but the EGW guide rod plug tightened it up. You have to fit your barrel to the Bunker Arms bushing. I think they are a better mouse trap. Too bad they only come in .701 OD.
 
#21 ·
The snap ring pliers were not great but better than nothing. I don't have access to hole gauges. I only have a good vernier micrometer and a not so good caliper. We'll see when the bushing arrives if it tightens things up. It should arrive in another day or so. It seems to be on tour around the eastern part of the country.
 
#22 ·
Checked the OD of the bushing that I am replacing. It measured 0.6935 inch OD. It wiggles inside the slide. I have a dial indicator that measures in ten thousandths of an inch. One revolution of the needle is 0.0080. After setting it up, the clearance of the bushing in the slide was more than the 0.0080 because the movement pushed the needle to the stops (beyond one complete rotation of needle) and would have gone farther.
 
#23 ·
I measured my barrel OD at .875", then ordered the bushing from Harrison Design.

It fit so much better into the slide that I almost needed the bushing wrench to turn it far enough to get the spring cap in.

Haven't got a chance to shoot it yet, but wow, the fit is so much more precise and no wiggle. Plus that bushing looks good!

Image
Image
 
#24 ·
My bushing arrived a few days ago. Thus far I have been working on its ID where the barrel is gripped when the breech is closed. After working with emery cloth I have gotten it to slip over the barrel but it is somewhat tight. The ID of the bushing was enlarged by chucking up a small bore shotgun cleaning brush in my drill press and wrapping it with emery cloth.

How tight it should be?
 
#29 ·
Tested out the new bushing but groups showed vertical stringing. I realized that I did not provide sufficient relief so the barrel can be shoved into the locking lugs without flexing the barrel. I relieved the problem and the vertical stringing vanished. Groups are now acceptable and I could stop here. But I was never one to leave well enough alone. The larger contributor to group size now is horizontal. I have not determined if I am causing the horizontal spread or the gun is. After the first few shots the sights blur along with the target. Groups are under 2 inches at 25 yards.
 
#31 ·
When I shoot off sandbags I rest my forearms on the bags just behind my wrist with no part of the pistol touching the bags. Should I rest the pistol on the bags and if so, what part of the pistol? The end of the magazine or the part of the frame that is just beyond the trigger guard? Probably should rest eyes between shots to reduce blurriness.