Why drop in a bushing? It is very important to the accuracy of a 1911.
Take good measurements and have egw build on that fits perfectly.

can you fit a “ drop in” bushing? Maybe, if it is loose enough, and that will degrade accuracy.
If it’s tight, may lead to springing.
Kind of a critical part of you ask me.

 

It could greatly affect your accuracy. The bushing should be sized according to OD of the barrel and ID of the slide bore. If your split bushing is not broken and fits the slide muzzle and barrel well, I'd leave as is.

Edit: above advice also sound you can custom order a bushing based on these 2 dimensions and EGW will make one that fits. If you're not sure how online then give them a call they'll advise you.

 

Well, let's define Series 70 Bushing here -

Do you mean an actual Series 70 "accurizer" collet bushing from an actual 70 Series Colt made in the 1970s?

Or do you mean a standard every day 1911 bushing from a gun you're calling "70 series", or possibly from one of the new made Colt repros which didn't actually incorporate the main Series 70 change, which was the bushing and barrel...?

My understanding was actual 70 Series "accurizer" bushings had barrels of a different profile because of the fingers, and it might be better to rebarrel them if needing to replace the bushing with a non-collet bushing? Someone will need to correct me if I'm wrong here. The only 70 Series guns I've owned had replaced barrels and bushings; none of them had the original collet bushing so I wouldn't know from experience.

 

Buy an EGW bushing. Nothing is drop in on a 1911.

 

The 70 series was a unique deal and if it wasn't set up right the bushing leafs would break from it. Measure your barrel and slide and tell EGW what you want, if it doesn't slide in you have very minimal fitting. Go with the angle bored, it's the one.

 

EGW makes good stuff. Again 1911 parts are not necessarily drop in. I bought this tool from Brownell's for fitting the EGW bushing and got a good enough fit to require a bushing wrench to take it out. Very pleased with the fit.

BROWNELLS Bushing/Compensator Fitting Mandrel SKU: 080804100

Check out BROWNELLS Bushing/Compensator Fitting Mandrel SKU: 080804100 available Online at Brownells Today and many more Gun Barrel Tools products are available in our Tools & Cleaning Department.

www.brownells.com

 

EGW is the way to go.Ive replaced 2 Series 70 -4 prong bushings with EGW bushings.Worked like a charm with slight lapping the last .001"