Model 745

kharmakid

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Morning gents, recently a friend brought me a model 745 with an extraction problem, this pistol also has a stainless slide, but is clearly marked 745.
Problem is about 1 in every 4 rounds has a problem ejecting, it is pulled out of the chamber fine but seems to hang up on the case mouth of the next round in the mag, any one heard of this issue
 
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Broken ejector?
Recoil spring too heavy for the ammo?
Damaged extractor hook?
Extractor spring weak/broken?
Gum/gunk/debris in the extractor channel?
 
745

Extractor is fine nice and sharp, new extractor spring, completely stripped and ultrasonic cleaned and lube, new mags im just baffled
 
...it is pulled out of the chamber fine but seems to hang up on the case mouth of the next round in the mag, any one heard of this issue

The case mouth of the top round in the magazine would seem like an unlikely obstacle. Why do you think it's hitting that? Is the extracted case slipping down from the extractor's grip & hitting it?

I believe the extractor tension is supposed to be set to a specific strength using a gauge.

.
 
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Can you induce this malfunction and take some clear pictures of it and post them?
 
I have a definite theory on what could be happening and how it can be remedied:

There is a hole under the rear of the extractor where a coil spring lies that tensions the extractor. I believe that Smith & Wesson made some manufacturing errors during the production span of the 745 and they inadvertently drilled some of the holes too deeply with the net result being less spring tension on the extractor than is specified and needed.

The first 745 that I bought exhibited similar failures and a new spring didn't fix the problem but shimming the spring so that the hole was now (effectively) less deep absolutely fixed the problem and I have a couple thousand rounds since the fix with zero failures such that I've personally considered mine "fixed."

Find something to put in the depths of the hole to give the spring more tension. Professionals would use a gauge to measure extractor tension, but I don't have those tools. However, simply pushing the rear of the extractor can give you a lot of feel to check -- there needed to be a LOT more resistance than what I was seeing when I was experiencing the failures. Shimming the spring gave me a lot more tension and the gun runs beautifully now.
 
745

The case mouth of the top round in the magazine would seem like an unlikely obstacle. Why do you think it's hitting that? Is the extracted case slipping down from the extractor's grip & hitting it?

I believe the extractor tension is supposed to be set to a specific strength using a gauge.

.
Every case that hangs up has a clear and defiative mark relative to the case mouth of the next round, sometimes you can get threw a whole mag other times it hangs up every 4th round. I shall try a stiffer spring
 
Model 745 (and others) Recall

Hay Karma,

If the below is inapplicable, there is at least one, maybe two more possibilities, but I really need to get my brain in gear to address 'em for applicability herein. The below just came to my brain more quickly and fully than the other/s.

Later.

DC

SMITH & WESSON
MODEL 4506, 4516, 645 & 745,
45 AUTO CALIBER, PISTOL MAGAZINES
RECALL: It has come to our attention that a small number of users have experienced cartridge-feeding problems with Smith & Wesson magazines for .45 ACP pistols. This can result in a failure to feed or jamming, and thereby a failure to fire. The cause of this problem is the magazine.
This recall applies to two types of MAGAZINES ONLY:
Magazines manufactured by Smith & Wesson for Pistol Model number 4516.
Smith & Wesson requests that you inspect your caliber .45 ACP magazine to determine if it is subject to this recall. To determine if your magazine is affected, follow these simple inspection procedures:
Inspection Procedure for Magazines for Model 4506, 645, or 745 Pistols.
Remove the magazine from the firearm following the procedure set forth in the instruction manual. Before proceeding further, you must ensure that the pistol and magazine are unloaded.
Examine the butt plate of the magazine. If the butt plate is not molded plastic with a crescent- shaped cutout molded into the bottom near the front edge, then the magazine is not affected by this recall. If the butt plate is molded plastic and contains a crescent-shaped cutout molded into the bottom near the front edge, proceed directly to the next step.
Carefully inspect each broad flat side of the magazine near the plastic butt plate. If a punch mark is present above the butt plate on either side of the magazine, your magazine is not affected by this recall.
If, however, a punch mark is not present on the right side at the bottom, your magazine must be replaced.

Inspection Procedure for Magazines for Model 4516 and 4516-I Pistols. 
Any magazines shipped by Smith & Wesson with model 4516-I pistols are already inscribed for use in that particular model and are NOT subject to this recall.
Remove the magazine from the firearm following the procedures set forth in the instruction manual. Before proceeding further, you must ensure that the pistol and magazine are unloaded.
Inspect each broad flat side of the magazine. If neither side is inscribed "For S&W M4516 only" or "For S&W M4516-I only"; your magazine must be replaced.
To ensure reliable functioning of your Model 4516 or 4516-I pistol, the model number marked on a 7-round .45 ACP magazine must be identical to all digits of the model number stamped on your pistol. Do not use a Smith & Wesson magazine marked "M4516 only" in a pistol stamped "MOD 4516".
WARNING: DO NOT USE ONE OF THESE RECALLED MAGAZINES IN YOUR PISTOL FOR A SITUATION WHERE A FAILURE TO FIRE CAN BE CRITICAL, SUCH AS FOR LAW ENFORCEMENT OR PERSONAL PROTECTION. RETURN AFFECTED MAGAZINES TO SMITH & WESSON FOR FREE REPLACEMENT.
To receive a free replacement magazine under this recall, send the magazine to be replaced directly to:
Smith & Wesson
Attention: Magazine Exchange
2100 Roosevelt Avenue
Springfield, MA 01102
Or call toll-free 800-458-8469 between 8 AM and 5 PM EST. You will need to provide the customer service representative with the model and serial numbers of your pistol. We ask that all affected magazines be returned to Smith & Wesson in trade for the new magazines.
This toll-free number can also be called if you have any questions concerning this recall.
We regret any inconvenience this may cause; however, this action was dictated by our concern for the customer's safety and the reliability of Smith & Wesson products in all circumstances.
Source: 
AFTE Journal, April 1990, Volume 22, Number 2:227
American Rifleman, January 1990, page ? 
American Rifleman, February 1990, page 4
Guns & Ammo, January 1990, page 93
Guns & Ammo, February 1990, page 7
Shooting Industry, January 1990; page 18
American Firearms Industry, December 1989; page 13
California Department of Justice Firearms Safety Note 89-4
 
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