u/ChevTecGroup

Inconceivable!

I may have solved them in mine. This problem started plaguing me after a few hundred rounds of chalk. It still worked fine with kak blanks, factory military ammo with the special soft primers, and a few other things. But its reliability with my favorite boland-fx blanks was getting worse.

Some of the boland blanks had copper colored primers and worked alright, the silver color primers would fail in the m203 but work in M79s and my hammer fired launcher. Boland refused to sort them so it was a crap shoot as to what you'd get. Eventually my launcher started failing to fire both types of boland blanks.

I had a firing pin protrusion gage that I got from sarco or some place like that. I also went ahead and grabbed a new striker/firing pin from gunbroker(which I immediately misplaced and will find later).

I figured out that you can test the firing pin protrusion by removing the barrel, sliding off the backplate, and pulling out the "follower." This allows you to dry fire the launcher with the barrel removed. According to my gage, my FP protrusion was in-spec. But it was in the middle.

I figured I'd risk a 35 dollar part and remove some of the material around the firing pin, allowing the FP to protrude further past the breach face. I threw it in my lathe and just touched it with a cutter to remove a small amount of material. You could probably do this with a drill and a file as well.

I also noticed some very slight mushrooming of the tip of my firing pin. Maybe this is wearing down?

I installed the striker and the FP was now protruding to the maximum allowance. But still in spec. I was going to go a little over but figured id try it.

I cleaned the inside of the receiver. Which hasn't been done yet. And I stretched the striker spring a little bit. Its a stiff spring, so grabbing it with 2 needle nose pliers and pulling, only did a little bit of stretching.

I put it all back together, grabbed a m212 case and some random blanks with silver primers and proceeded to blast of 4 or 5 blanks in the shop. All functioned perfectly. You could hear there was a little more force with the striker compared to before.

Of course the only pics I took were when I was taking it apart so I knew how to put it back together. But if I have time, ill do a video on the things I did to fix it.

Hopefully this helps anyone else that has trouble with their m203.

Website isn't updated yet so dont buy any tickets. But wanted to makes sure everyone knows that we are planning on doing it again next year, this time as a 2 day event with more vendors and more fun.

Afaik all the same vendors will be back plus more. Last year was a ton of fun and we got a lot of great feedback for improvements.

So start working up your loads and zeroing your sights if you are trying to take home a trophy. Or just show up an aim with vibes, works too.

Fit an finish was really nice. Came with everything you need, even the thread locker, which is a nice touch. Only thing id add is a small instruction sheet, but it was easy enough for me to figure out.

Now I just need a suppressor mount and some more mags

Get it before its gone.

I feel the need for a hymen lebman 1911 clone build next

Factory P90 from an estate of a dealer/importer. It was found mostly stripped so I had to source a MPG(bolt) and trigger pack.

Due to the scarcity of trigger packs. I got a semi one and swapped out the parts for some aftermarket FA parts. Which im still working on refining. The paperwork says it came from the columbia MO policy dept. So the selector had the "A" milled off and it had a small plastic stopper glued on to prevent selection of full auto. The stopper popped right out and I added the "A" back to the selector.

Still trying to decide what can to put on it. I have one of those free backdraft 4" cans with no use. Itd be compact and look good. But will probably sound like crap. I have a couple nicer cans but they may be too big for my liking. Decisions decisions.

I also need to get some sort of sights for it. It came without anything. I may try to mount a 407k down in the carry handle. But id settle for the factory rail if I had one.

Very windy and had a bad storm blow through this morning. But it sure looks nice now

It came with a post sample auto sear installed. So thats cool. The auto sear seems to be a copy of the design patented by Robert Burns (https://patents.google.com/patent/US5596162A/en) and changes the right side safety into a semi/auto selector.

It needs a little work as the previous owner passed away and left a lot of his stuff in a state of disrepair. The stock doesnt quite fit all the way and the trigger spring is installed wrong. But all.easy fixes. I also threw on this muzzle break for more of the 93r look. I need to bore out the end for 9mm as well.

Star Z-70b that is!

Just got a nice crinkle finish on this build. It could be a little better but im not blasting the whole thing and painting it a 3rd time.

1945 dated Russian PPSH-41 kit. Got a 9mm barrel for it. Plan on running drums with 3d printed spacers to improve feeding reliability.

I also have one of the 80% receiver sections for the back half. Can't decide if I just want to weld up these cuts or finish the 80% new section.

Part of me feels like just rewelding the original parts and not messing with the sights or anything. I also got some of the Rockmount Research filler wire that JP recommended for blueing, so we will see how that goes.

Recent auction pickup. Would have been a killer deal if the packing/shipping company didnt screw me bad. Still a good deal though.