Please share experience with machined metal breeches?
I was unable to find any info about breeches via search…
Does anyone have experience with machined metal breeches that they’d be willing to share?
The claimed benefits of better consistency, somewhat quieter and some more power with more durability sound attractive.
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When looking at the fracture. It seams to me it is fatigue. Look at the smooth surface of the top. That tear has some shots behind it and slowly grew. Then after to little material was there to hold things together the whole thing finally gave dramatically. I’ve seen this countless times in metal but this is the first I’ve seen in delrin.
it dam loud too init! ha, weird thing is slug still came out of the barrel through the chronny but was only reading about 11 ft lbs! strange….
breech must have blown just as slug was on its way down the bore???
Yep. Stuff sounds different.
I had pin holes in my foreman when the one I had went. Only took about 5 shots with one of my valve in a customers gun. I was shooting thru the chrony also.
was fitted to my .25 cal, dyotat could be right, was looking at the delrin of the original breech and I have some black delrin rod that I was making valve seats out of and it seems different density when you dig your nail in it, seems more brittle the breech material,
who knows,, but I will be sticking to ally or brass or delrin core with a metal skin around it, that didn’t half hurt when it hit my stomache! I nearly shit,,, was frantically searching for entry holes, haha. just trying to save lives here, so if you got a factory delrin breech be aware of the possibility,
blod valve can shift some air but didn’t think it would totally destroy my stock breech, got an old ally one stuck on it now, will do until I can knock a hybrid up,,
I think AF uses cheap Delrin. I had a factory breech explode also. I have never had a problem with a breech that I machined out of Delrin.
My .257 with .375″ breech makes 220 fpe. I have thousands of rounds through it.
What caliber that breech was used for?
no dieseling as barrel and breach were squeaky clean apart from a thin wipe of divers silicone on orings in breach, just running too much power for the delrin to handle, seen it happen once before, im using aluminium and brass breeches from now on, delrin is shite!
This seems like a Dieseling.
Be careful what you lubricate pellet/bullet with.
If i m right you are lucky that nothing pass through your tank.
Maybe a wrong material like this one i was mentioned at “titanium tube” topic …who knows.. 🙄
The fact that someone are engineers doesn’t means they Know about metallurgy.Metal world is like the universe…never being known until you die.
please don’t use original delrin breach for high power, if you have been your just lucky, this is mt original stock breach blew to bits when I was using my blodnob valve, exploded and shot a a piece of the breech into my stomache,
if I hadn’t been chronnying it a t waist level it could have blinded me, not worth the risk lads, take it from me!
Still metal rubbing on metal when cocking. It is better but breech is still heavy
anyone experience with machined brass breeches? (should be better then aluminium ?)
Aluminium sucked. I have sleeved a delrin one. So a press fitted delrin core and aluminium anodised outer. That will also give the cocking handle screw more meat. But for standard power setup nothing beats delrin. I use a cocking handle with 2 m3 screws and used helicoils in the breech.
i made an aluminum one and it doesnt slide right, maybe if anodized to harden the surface
i tried one in machining steel, its heavy….the problem is when the valve snaps closed….it pushes the breech forward…in high power rigs it can be pushed pretty hard, which is hard the the frame which should be stopping it to the point where the breech is able to lift off the tophat during the shot cycle and high pressure is released at the breech !!!
power and all remained the same compared to delrin…my main cause of going metal was the hammer spring was quite powerful, and the cocking handle would simply be torn out of the threads
if you push delrin inside the breech and bore it out it makes for much better sliding action….i did this after seeing pics here on the forum…i epoxyed it as well
To eliminate noise you need to put a 90 D o ring on the hammer. That’s the noise you are hearing.
I have a .25 setup with a reg shooting 950 fps and it is real quiet.
If I turn it down to 880 fps it is even quieter.
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I have had the same issue. Made me a little trigger shy for a while! 😯
In my case, I hadn’t opned up the breach end of the barrel enough, and had too much bullet still in the breach area. This acted just like a barrel obstruction.
The very same thing xould happen to any of us if shooting say at an upward angel, and a pellet part way falls out of the barrel and gets slightly sideways. Insant barrel obstruction and Ker-Blam!!! 😯
KnifeMaker