Brass breech frustration
Why are tuners selling brass breeches without telling you they don’t actually fit the new slide safety model guns? That’s a couple of hours of my life and 60 dollars I won’t get back. Are they not aware the breech design has changed. Grrrr.
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I run a brass breech in my rig and have had no problems with it.
Wildfire :5:
Hay thanks for the replies guys which is really helpful. I’ve drilled out the breech nob hole so it’s wider and a little deeper and then screwed a decent size allen key bolt in there. It has gone in beautifully and I put a bit of areldite in for good measure, although if I had seen your message beforehand Doug I would have gone for red loctite as areldite and delrin don’t seem to work together well. But I’m pretty sure that I’ve found a good solution, it felt really strong and I really doubt it will fail again. From your comments Doug I might leave it in permanently. Which means I’ve wasted more money on two brass breeches darn.
I suppose then guys in defence of brass breeches the one and only definite advantage is one that those that sell them don’t mention, namely the nob is highly unlikely to fail!
Thanks again for everyone’s comments.
Chrisyboy,
Some who make brass breechs may not be airgunners and wouldn’t necessarily be aware of the change AF made. But the majority of their sales are probably to the larger customer base with the older models.
The world is changing faster everyday :angrymob:
Delrin works fine for the breech. I still have the original breech in my .257. Yeah I don’t cock the gun with the breech but I have also shot 4200 psi in my gun. Breech is also thinner then a .25 because barrel is .374″ instead of .308″. I have probably 10,000 rounds through the gun if not more. Most of them just shooting through chrony into my trap.
Cedric’s breech did fail but it wasn’t the threads that went. It split at the top hat o ring.
If you want the threads to not fail you need to use red loctite on the cocking nob.What kills the threads is firing the gun when the nob is loose. They will over time come loose from the constant beating. At first notice apply red loctite.
When you change the weight of the breech it effects the opening of the valve. Or should I say when you are making 170 fpe it does. Not sure if it effects a gun making 45-50 fpe.
I made a aluminum covered breech for Cedric and just that little bit of weight made his gun go from PW 3 to PW 6 to work like it did before.
Here is what they look like.
There is none. There are stronger but the side effects are not worth it.
When you start trying to make power the effects are even worse.
What is supposed to be the advantage of a brass breech?
GsT
Hay cheers Doug. I’m learning fast. The thing with the delrin breeches though is the knob thread goes, as I have discovered, err, from messing about trying ti fit brass breeches. Airforce should put a thread insert in, its just a matter of time before they go if you have a stiff spring in.
Brass breeches don’t work good period. The extra weight takes more preload to open the valve. Nothing is better then a delrin one.
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Good to know Wildfire