One for you ex armorers

[c310pilot]

How do you push the pin out of the receiver that hold the gas tube in place? I have tried a bunch of things and am afraid I am just flaring the end. Are the tapered pins available?

Information

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[Peter Laidler]

The tapered pins are just a standard morse taper pin available from any engineering supplier. Mistake number 1 was trying to hammer it out. You should have used a press with a short stubby drift fitted in order to start the taper moving. Once the taper has been broken it wil just slide out - providing that you are pressing WITH the taper and not against it.

Next question is a) WHY do you need to replace the gas cylinder and b) what mark of gun is it? If it is a Mk1 or a 3 gun, your problems might not even have started yet because on some well used and worn guns, that gas cylinder just ain't going to move without a LOT of heat and aggro.

When we were removing them, we had a 'spanner' made from a gas cylinder sleeve (the bit at the top of the bipod.....). We'd heat the threaded portin of the body and cylinder up and try to unscrew it. Mostly they'd be as tight as a ducks ars.........., er........, bottom. So we'd just weld a big nut to the gas cylinder and unwind it with a spanner. BUT BE WARNED....... you could unscrew the thread as well.

Maybe Brian at BDL could come in here too.......... There was also a special alignment gauge for aligning the new replaced cylinder but you can do without it if you use your loaf and have a good eye

Replacing gas cylinders on Brens............. the worst job that there is on the gun and the biggest cause of workshop write-offs

[c310pilot]

I purchased the Bren 7.92 receiver that has pics on this site last year. The company here in the states that demilled it used a hamer to remove the gas tube. I need a replacement so I was trying to disassemble another MKII kit I have to get the parts necessary to reassemble the front end to make this a working semi.

[Peter Laidler]

Ah, a Mk2 Bren has a press-in/pull out gas cylinder. But you'll still need to rotate it in order to draw it out.

Just don't expect the taper hole in the gun body to align with the recess in the new gas cylinder......... It won't. I know that they use jigs etc to align and drill but while life at the factory was like that, life on the shop floor wasn't that simple. Same as No5 flash eliminators - you'll need to ease the two holes into alignment with a reamer. Bren gas cylinder removal, the stuff of armourers nightmares. Done loads and loads of them

Anyhow, let us know how you get on

[HILLBILLY-06]

I purchased the Bren 7.92 receiver that has pics on this site last year. The company here in the states that demilled it used a hamer to remove the gas tube.

Yeah, if all else fails, always use the (V.L.F.H.) to get it off. That seems to work great "most of the time" but when it don't, its usually beyond fixing, thus putting in requisition for new part will have to do at that point.

[Kev G]

Are the tapered pins available?

Yes the tapered pins are available - http://www.bren-gun.com/index.html/h...dy_group1.html
Item 21

ATB Kevin

[tankhunter]

I purchased the Bren 7.92 receiver that has pics on this site last year. The company here in the states that demilled it used a hamer to remove the gas tube. I need a replacement so I was trying to disassemble another MKII kit I have to get the parts necessary to reassemble the front end to make this a working semi.

Pilot: If you are Going to remove a gas cylinder from ANOTHER parts kit. Is the section of the reciever that you are going to be needed again at all?
If not, your problems are halved!

You can remove metal down from the top of the gas cylinder area to JUST to the point were it is ALMOST going to break through to the cylinder itself. A Smart Blow with a Hammer, & CRACK. The metal should split & you might find it
a LOT easier to remove the Cyl itself. If this fails. remove metal either side of where is has cracked through & Soak in Penitrating fluid for a day or so & try removal again.
Obviously, this section of the reciever area is then sacrificial. But, If you only bought this as a source of spare parts to keep your potential shooter running. This shouldnt be a problem for you.

Getting the Old gas cylinder out of the reciever area of the one you are going to USE. Is a different matter! Peter has covered this area of Potential 'Fun' already!.................Good Luck!

[c310pilot]

I hate to completely destroy the donor receiver as they are worth several hundred dollars. Perfect world I could find replacements with out even messing with the donor.

[Brian Dick]

I don't have much to add except I've changed a gas cylinder on an early Enfield Mk.1 and it was a job to remember. The taper pin wouldn't budge and we didn't have a press but did have replacement pins so we drilled it on a mill and knocked it out with a drift punch. We wound up having to weld a tractor lug nut on the original worn cylinder as per Peter's instructions. The trick using the bipod boss as a wrench wouldn't budge it. Luckily, when it finally broke loose using heat, it unscrewed without galling the fine threads on the inside of the receiver. A BIG worry for me working on someone else's $25,000 gun!!

[c310pilot]

Your a braver man than me! I wonder why the people that demilled some of the Brens in the US removed them in the first place. I didn't realize Kev had started a spares parts site. I had purchased many L4 parts from him in the past so I shold be able to get what I need from him. How much suncorite ro you have left?