Drum Lips

[Sgt]

After loosening up some rails in my Kahr C drum, I'm still getting some rounds that feed sideways. In fact some rounds seem to have a lot of resistance where the round casing sticks on the drum feed port. I decided to compare its lip angles with a GI L drum. I noticed that the L Drum lips flare out substantially more. Do you think I should carefully match its flare on the C drum lips? See comparison below:

http://home.comcast.net/~ralfdog/Misc/Lips.jpg

[adlake]

That WWII drum, would that be a Seymore? Cuz, I think there were the only ones that here "Flared" up.-adlake

[Sgt]

adlake--

Good observation, you are absolutely correct. I assumed it was a Bridgeport, but didn't know for sure. I just grabbed the first drum part nearby, which was from my Frankenstein parts box. The id tag was completely rusted out. After reading your post, I grabbed a good Bridgeport out of the safe, and it has no flare. I suppose the flare is not necessary for the good functioning of my C drum.

 

Anyone know a good fix for rounds feeding in crooked?

[Uncle Dudley]

I'm guessing--1 more click and some Gibbs sprayed on the guides and floor?

 

The only time mine did that was in an original Colt (28 Navy) that needed to be cleaned in the bolt and chamber badly. My WH 28 and Savage 28A1 work flawlessly with the new "C" drum. I think the bolt on the Colt was hanging up either going or coming. Could this also be caused by a weak recoil spring?

 

UD

[photonance]

I have had the same problem with my new Kahr C drum. It will turn a round sideways in the drum. It has been doing that only once per 100 rounds. I thought I would send it to Merle the drum doctor, but I don't know how to contact him. Does anyone have his contact info? Also, I have changed recoil springs, and that didn't help.

 

Thanks,

Rob

P.S. The gun I am shooting with is a 1928A1 Savage.

[TAS1921AC]

tsmgdrumdr@msn.com

(503) 623-8294

[photonance]

Thanks Tom!

Rob

[Sgt]

Yea, I've decided to send mine in too. Thanks all!

[artie in miami]

I remember reading that Seymour Mfg Co had problems with their magazine lips...I found an old article on the TSMG News Online back issues about WW2 drums...it seems that they made all their stick mags with lips that would not fit in the M1A1 guns...all the mags (2 million I think) from that run had to go to another company to have the lips fixed. The second company had developed a jig to hold the mags and fix the lips...I guess Seymour made good stuff...since they got more contracts for mags, even after this problem.

 

Originally, I come from Derby, CT which is a few miles down the Housatonic river from Seymour Mfg...yet I never, ever found one stick or drum mag in a yard sale. Most people take things home from work...just in case they ever need it !! I always expected to stumble into a case of drums or sticks at a yard sale...never even saw a piece of one. Maybe the security was watching for that, or people were patriotic and did not take stuff home. Here in Miami, I ALWAYS see things that are "borrowed" from factories and businesses. I guess that was a differant time and place.

 

artie in miami

[gijive]

QUOTE (artie in miami @ Jul 27 2007, 01:08 PM)

I remember reading that Seymour Mfg Co had problems with their magazine lips...I found an old article on the TSMG News Online back issues about WW2 drums...it seems that they made all their stick mags with lips that would not fit in the M1A1 guns...all the mags (2 million I think) from that run had to go to another company to have the lips fixed.  The second company had developed a jig to hold the mags and fix the lips...I guess Seymour made good stuff...since they got more contracts for mags, even after this problem.

artie in miami,

 

I think you are mixing up Seymour with a different WWII contractor. The Seymour products worked great and I believe they even got an award for war production materials. I don't have access to the articles since I am overseas. Maybe go back and reread the article, I think you might be thinking of Crosby Corp.

[TSMG28]

Artie,

 

GIJIVE is correct. It was Crosby that had the interference problem with their 30-round box mags in the M1 Thompsons. The "fix" was to reform the lips and grind 0.060" off the front lip. I have several examples with this modification. Here is a quote from the History of the Box Magazine in the Thompson Collectors News from 2001.

 

"Not all was rosy for Crosby. In September of 1942 it was discovered that 35% of the magazines tested would not fit into the MI Thompsons. The remaining 65% would fit the MI only with 20 pounds of hand pressure to lock into the gun. It was determined that due to the Crosby magazines having a more pronounced flare at the front of the body and the MI's receiver magazine well being reduced in size, there was an interference fit. The Augusta Arsenal devised a simple solution and produced some hand operated tools to reform the feed lips on the magazine. This operation also required to grind .060 inch from the front of the magazine lips. Cost of the modification was 6 cents each."

 

You indicated that you found something about WWII drums with a fit problem in the TCN. What issue was that? I don't remember the Seymour drums having any fit problems.

 

Hope this helps.

 

Roger

 

[artie in miami]

Yes...I was doing that from memory, and I knew it was not AO...I guess I confused Seymour and Crosby...Sorry for the mistake...thanks for setting it straight.

 

artie