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Beretta 303 clean up


craig1982
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I have a Beretta 303 semi auto which gets very little use, I took it out the other day and it does not cycle 100% even on 32g cartridges. I want to give it a total clean up. What do people use to remove the carbon from the piston, cylinder and gas port. The cylinder is very grimy, what will dissolve the crud ? 

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Bore cleaner and an old toothbrush will clean the piston. For the gas port's I have a small screwdriver that I have ground so it has two flats and is tapered. First time you do it you will be surprised how much carbon comes out. I have a 302 that will cycle 24 gems no problems. It's always the gas ports that are the problem.

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I recently bought a 301 'scrapper' that was sold for parts. When I stripped it, it was filthy. I used GT85  and a brass brush to clean the piston. The rod that the piston fits on I cleaned with a nylon pan scrub and again GT85.  I then soaked the piston housing on the barrel with the same fluid and left it whilst I had a coffee. I then used an old screwdriver to get most of the carbon off and then a wire coat hanger to clean the barrel ports. I removed the stock and then the recoil spring fitted inside the stock tube. I replaced that spring with a new one. Just a point, IF you should change that spring it is NOT the same as the recoil spring in a 390/1 onwards. So watch out for that. The gun had a damaged piston and a couple of parts missing off the trigger unit. I replaced the missing parts and put in the bolt from my 303. The gun functioned perfectly including 24 grams. Just need to locate the upper portion of the bolt now. I use GT85 for cleaning all of my guns and has never been a problem and at £3 a can is a cheaper option. It is NOT a lubricant though.

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2 minutes ago, Westley said:

I recently bought a 301 'scrapper' that was sold for parts. When I stripped it, it was filthy. I used GT85  and a brass brush to clean the piston. The rod that the piston fits on I cleaned with a nylon pan scrub and again GT85.  I then soaked the piston housing on the barrel with the same fluid and left it whilst I had a coffee. I then used an old screwdriver to get most of the carbon off and then a wire coat hanger to clean the barrel ports. I removed the stock and then the recoil spring fitted inside the stock tube. I replaced that spring with a new one. Just a point, IF you should change that spring it is NOT the same as the recoil spring in a 390/1 onwards. So watch out for that. The gun had a damaged piston and a couple of parts missing off the trigger unit. I replaced the missing parts and put in the bolt from my 303. The gun functioned perfectly including 24 grams. Just need to locate the upper portion of the bolt now. I use GT85 for cleaning all of my guns and has never been a problem and at £3 a can is a cheaper option. It is NOT a lubricant though.

if its the bolt locking piece you want I have a spare one here you can have. Its the roughly "L" shaped part on the top. PM me an address and I'll pop it in the post asap.

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If like mine there's a slight looseness of the trigger group when the gun is assembled I found a small 1 inch square piece of duct tape fixed to the inside of the receiver resolved it. I don't know whether that's a problem with only the 302 which mine is as the magazine cutoff is the main trigger group pin but if yours is the same it works! Also made a shim for a slight bit of play in the forend and that's sorted now as well.

Edited by Wingman
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