my ninteen-elemon

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mjsdwash

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Hello everyone, I hope I'm putting this question in the right area.
Ive been reading off this forum for quite a while, and finally decided to join in.
Maybe someone can help me figure out a problem I'm having with a Springfield GI jamming on a rare, but disturbingly common basis. Its live round stovepipe, with the tip of the bullet under the barrel hood. This is with ball ammo, Checkmate GI/Springfield wadcutter mags. The slide, ammo and feed ramp are all correct spec, but i cant find the correct angle for the magwell. I read somewhere 14.55° but mine reads just about 17. This is different from a RIA gun a checked, that came in at about 14, so one of the two is wrong. Any guesses?
 
yea, extractor shoud be good, tried the factory and an ed brown that was professionally tuned, they act the same
 
Mr. Wash

Read the description of the problem you are experiencing & do believe i can be of assistance to you.
1. Remove barrel from slide
2. Turn barrel up-side down
3. Under strong light exam the end of the hood extension. You should see a 45 degree chamfer---hood chamfer.
4. Secure barrel in padded vise
5. Take piece of red crocus cloth & wrap around a pencil or hard woo dowel of approximately the same diameter.
6. Maintain the same angle of the chamfer & polish brightly with crocus cloth.
7. Move the polishing paper inside the hood extension & polish up into the top of the chamber---be gently !!!
8. Put hard felt bob tip on dremel tool & a finger tip dab of flitz polish. Squish polish into the felt.
9. High speed polish the areas you just worked on, wipe off, & buff with clean soft cotton patch or towel.

If problem is solved or it continues, please notify this thread.

Thanks !!!!!!!!
 
thank you guys both so far, ill give it a shot, and try over the weekend, and get back after some live fire. But still out of curiosity do you know the correct angle for the magwell to frame rail? Having two different angles between guns makes me nervous.
 
What you are referring to is the "feed ramp" angle, not feed rail. So long as the angles fall withing the specifications laid down by john moses browning in 1908 & finalized and accepted by the dept of defense in 1911, don't fret about the angle of the ramp, so long as the feed function is satisfactory. Remember all engineering tolerance specs are always listed as "plus / minus"---if the measurement falls somewhere in this gap, then all is well.
 
still no luck, didnt try with ball, im out at the moment, but with lead round nose 230grain, loaded to about 1.258 +- 004 (smaller causes more jams, longer locks the slide back before empty, even with the slidelock dimpled), and 5.6 grains of bullseye, mixed brass, cci primers. 16lb recoil spring btw. Jams are infrequent, but enough to be embarassing, and keep me from carrying the gun. Well any further suggestions? Thanks again.
 
Mr. Mj

Now is the time to polish the feedramp, barrel throat, & the chamber break-over ledge. This ledge is where the barrel throat transitions into the chamber. Polish these areas with red crocus cloth wrapped around a wooden dowel. Maintain all original angles & polish gently. On the ledge, give it a gentle polish with the cloth about a 90 degree angle & polish just enough to break the sharpness of the ledge. Polish with felt tip, dremel tool, & a paste metal polish. Buff with cotton rag. Also good to do the same thing to the chamber walls.

Just remember to be gentle !!!!!!
 
"Its live round stovepipe, with the tip of the bullet under the barrel hood."

Usually called a 'bolt over base' malf. Cyclic rate of slide is exceeding the magazines ability to keep up.

This is typically seen towards the bottom of the mag when mag spring pressure is at its weakest.
Weak magazine spring is the most common cause. Even on brand new mags.
Wolff extra power springs can help.

CMC Powermags have really strong springs.

I lightly oil the interior of my mags. This can help.

Too heavy of a recoil spring will increase the cyclic rate. 16lb. spring for a 5" is correct.
A shock buff can speed up the slide.
Exotic lubricants can speed up the slide too!

A reduced radius firing pin stop will help slow the cyclic a bit.

Good luck.
 
Guru, I guess I should have mentioned I went through most of the archives, looking before asking questions you already answered, got the polish and ramp work taken care of, actually springfield did it for me, but did a pretty good job.

Rogersprecision, Im not too sure but I thought a bolt over base locks up the gun. This malfunction I push the button, the mag usually falls out under its own weight, 1/8 pull and the round drops out the well. The mags are new, I'm using three. I switched to Wolf 7 rnd extra power springs, and CLP, both of which brought down the jam rate, no buffer. Jams occur on the second to last round sometimes, but 8 out of 10 are in round 2,3,or 4. Never, that i recall round 1, or round 7 acting up. Slidelock reloads are always smooth, and correct. I mentioned Checkmate mags, bought off of topgunsupply, GI feed lips. The springs in this seem alright, but you think i should Wolff them out? I cant really tell by feel the difference, and dont have a scale to verify the springs. Im also using Colt hybrid mags, they work pretty good, but cause many jams on really short rounds (1.235 or less) But are real good with ball, terrible with hollow points. McCormmick 8 rnd are the most problematic by a longshot. Most every jam you can associate with the flat follower.
 
I should mention if it helps, the gun is almost as reliable with wadcutter as ball, wadcutter jams about 1 in 60 or so, ball at maybe 1 In 75. Mysteriously I kept cout for one long stretch with little cleaning, no jam until round 499. Ide be happy with that, but it dosent wanna go that long anymore.
 
Well, I bent the magazine follower 2° out to try to match the magwell angel of another 1911, and got 110 rounds fired with no problems, so I guess Ill stick with that until I get more info. Thanks for your help!
 
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