New Old Parts
Posted 22 June 2004 - 03:47 PM
Posted 22 June 2004 - 04:11 PM
Stay away from WH parts. Many are not of spec.
First, I'd really want to know exactly what the problem is, before I just globally replaced parts. Could be something simple but easy to overlook. Has PK chimed in on this issue you are having?
I would think it virtually impossible to wear out a Thompson part, save for the springs, rocker, and maybe disconnector. Could be wrong about that!
We wary of unused parts. Could just be reblued to look new. I'd start with Doug R. And Phil. See the FAQ.
Posted 22 June 2004 - 04:23 PM
Posted 22 June 2004 - 04:32 PM
Posted 22 June 2004 - 04:45 PM
Possible causes to consider: If it is a WH, the feedramp may need work. If it is anything else (including WH), is the ammo in spec, or is it overlong reloads? It your main recoil spring correct? Try a Wolff spring. Is the front ring of the bolt face chipped where the cartridge rides up during feeding?
Is the chamber too deep? (this is a cause of light primer strikes, as can be a chamber too shallow).
In all honesty, the only things I can think of that may need replacement (rather than rework) are the spring, hammer, firing pin, and possibly the bolt if it is chipped.
Posted 22 June 2004 - 06:56 PM
Posted 22 June 2004 - 10:41 PM
Forgive me for bringing my problem up again; don't blame you if you get tired seeing it. The gun is a Savage 28a1. I use the 220gr ammo, some stuff made in Africa I believe. Don't have the name in front of me. I didn't see any defects in the bolt face. In fact, I already replaced the actuator, bolt, buffer pilot, firing pin with used ones. I also tried an old recoil spring, but don't have a lot of faith in it. I don't know how to measure the chamber depth or what it's specs would be. Does the gun store sell "go" "no-go" gauges for the military Thomspons, or is there another way to check it? Would light primer strikes be caused if the round does not fully chamber? How can you tell if a feed ramp needs work?
Yea, I know that the best thing would probably be to send it out, but it would be nice to learn how to diagnose this problem. At least I'll give it a whirl, with all your kind help.
Phil-- I will email you about some parts shortly. Thanks
Posted 23 June 2004 - 12:08 AM
is this problem something that cropped up recent, or was it always there?
Posted 23 June 2004 - 12:42 AM
Posted 23 June 2004 - 06:34 PM
Posted 24 June 2004 - 12:12 PM
My fix was one of those Gunmachines telescoping pilots.
Posted 24 June 2004 - 03:09 PM
Posted 25 June 2004 - 05:25 PM
You said your gun did this since you had it. Was your
gun new in the box or had it been fired by first owner?
Posted 25 June 2004 - 07:58 PM
I have a military production, 1928a1 Savage. Judging from the barrel, I'd say its been fired a lot. According to the paperwork, It's had two owners before me, not including its service in the military. When I got it, the buffer was completely obliterated. I installed a new one and took it out for a spin. This is where I am today.
Posted 26 June 2004 - 01:03 AM
230 gr round nose cast bullets in my 28 a couple
years ago and it started the same thing. I found
that the cast bullets were leaving a small deposit
of lead at the base of the chamber. After several
hundred rounds it added up enough to not let the
round seat to the bottom of the chamber, in turn
the firing pin hammer would not get a good hard
hit on the firing pin because the bolt stopped
short. I found the lead with a strong light. I made
a probe/scraper out of a womans hat pin and
CAREFULLY got the lead out with out scratching the
chamber. Now I never shoot cast in my Thompson.
Just a kinda sounds like a short chamber and
bolt not going fully home.
Yours won't run fully and mine won't stop, if
we could put them together we would have a
fine one. Ha Ha
Hope I helped a little.
Posted 26 June 2004 - 09:04 AM
That did help. I'll take it apart tonight and see what's in there. There's not telling what was shot through that gun. I cleaned a lot of chamber debri the first time around, but didn't to look for the harder materials in there. Your description fits exactly what its doing. the indentions on the primer are intermittently shallow, which would be caused it the bolt didn't travel fully.
Posted 26 June 2004 - 08:41 PM
The more and more you look at your problem, it does point to both the spring and the ammo. The Thompson is, after all, a simple blow back principal gun and if the ammo is weak, or the spring is weak, the dam thing will not cycle properly.
Doug Richardson has all the parts you would ever need for you 28.
A year back I purcased a Savage 28 and when it arrived, every dam part inside the receiver was missing. I was able to get a complete set from Doug.
Hope this is of some help.