Trigger Pull

[Abwehr]

Hey Guys,

Here is a thread on Gunboards about lightening the trigger pull on a TNW MG34. I don't have one, so I can't vouch for the information. Here is the link to the "Machine Gun" section. Go to the thread dated 11/11/05 named, "TNW MG34....": http://www.gunboards.com/forums/forum.asp?FORUM_ID=9

Hope this is good info for you guys with SA MG34s!

[mp5]

Sounds like he is polishing away at all contact points, but then he says the replacement of the TNW firing spring with an original one is the key.
Would that result in light primer strikes?

Jorge

[762x51]

Sounds like he is polishing away at all contact points, but then he says the replacement of the TNW firing spring with an original one is the key.
Would that result in light primer strikes?

Jorge

Abwehr - THANKS FOR THE LINK -

Jorge - I've wondered about the use of the very heavy spring myself -

TNW retracts the firing pin the same distance as in the original MG34, they just changed the way it is captured in the cocked position.
The original spring works fine in a FA gun so it stands to reason that it would have sufficent power in the semi-auto application.

Anyone else have any thoughts on this?

Regards,
Orin

[Abwehr]

When I read the information, I wondered what he did with the "polishing". If he ONLY polished the contacting parts, everything would be OK, but some folks want to do a little more than polish and they remove too much metal.

On another similar note, sometime polishing does not do what you want it to do. As an example, I did engineering on stainless steel tanks, piping, etc. for the food industry. Any food industry that deals with a product that contains dairy products or eggs, the piping and tanks must be very highly polished, expecially in piping where welds are located so cleaning in place (CIP) would be efffective and not "hide" the possiblity of an area where "bugs" can grow. This is very understandable, but the specifications call for all surfaces to be polished. Well, a cold rolled mill finish stainless steel plate, pipe etc (no welds) has a better RMS (surface roughness) surface that a polished finish. It is hard to believe, but true. The surface is not shiney, but dull, and the RMS (a profile of the surface) has less peaks than polishing. I wish I could show from a graph, but have none with me. The one good think about polishing, even with a worse RMS, the peaks are more rounded than sharp so you get the feel of a smoother let-off. The other good part, is the differences in the "peaks and valleys" are that oil or grease has a place to collect to help the let-off feel smoother too.

[Intruder196]

I am not sure about all the polishing he mentions.

I have had problems with mine not staying cocked, resulting in slam fires which will make the gun sound FA. It happens when the TNW sear wears out. I have made my own replacement sears. The first one I made wore out after 1000 rounds and started doing the same thing. It either slam fires on soft commercial primered ammo or just dimples the primers on hard berdan-primered surplus 8mm.
I have often wondered about the reason why TNW has that heavy FP spring. Think I will swap mine out and see if it improves the trigger pull or not.

[ak47dennis]

I never installed that killer firing pin spring in mine, I was told by TNW that they include it cause during R-n-D they found that certain surplus ammo wouldn’t ignite due to rock hard primers. I was told no reason to use it unless I was having weak strikes.

[Intruder196]

Last night I swapped out my TNW FP spring with an original Mg34 spring and the trigger pull was noticably harder. I re-installed the TNW spring and it was easier to pull the trigger. Maybe my TNW spring has broken in. I have run about 3000 rounds thru my gun.

[junglewalk]

HOLEY MAD COW !.......All this time i was thinking the opposite would be true... ...Has anyone else found it this way too ?.....I have got to swap mine and see....jw