Franck

Up early this Saturday morning and opted to test the mags. No one at the range. Success Two of the three mags held open the bolt after last cartridge fired. The original and one of the backups. A bit more cleaning and lubrication on the third. Case closed.

Had a close look at the system and decided to on the KISS principal for diagnosis.The rectangular black plastic "PIN" pushes up on the bolt release lever to secure the bolt when the mag well is empty. As the cartridges are being stripped off without an issue, very pleased about that aspect, this verifies the rearward motion of the bolt is functioning correctly. The requirement for a smooth upward operation of the mag well is essential to hold the bolt "OPEN" via the pin that is external to the mag well. Will clean and lubricate the plastic components with a silicon spray and test my theory on Tuesday. The range will be over crowded this long weekend.

The bolt remained open after last cartridge was fired for approximately the first 50 rounds. Then intermittent operation. I purchased two additional 4 round mags and thought that the mags were the issue but the original mag also has the issue. No way to test the recoil spring. A spring should become weaker over time and therefore allow the bolt to slide rear ward with less resistance. Uncertain as to why this occurs. Open for discussion.

I use a 1/4 inch drill bit taped off to torque down the barrel nut. Located in Western Canada. Village of Wabamun. 65 kilometers West of Edmonton. Piston seeger holds the PEA (piston extension assembly) as one unit, together. A malleable c-clip. I do not understand why the PEA and the piston are allowed to slam against each other. I was considering expanding the seeger to couple them together, as it is possible. Any ideas about that idea? Any further ideas as to why the bolt doesn't remain open? Thanks Frank

The kit I ordered has the identical parts currently in the rifle. The o-ring fits the cylinder plunger pin and the damper is on the right side of the image. Those items were purchased in addition to the kit. I originally wanted a piston seeger but the Canadian distributor did not stock this item. Have a couple of questions about the Piston Seeger but will wait for your reply.

The gas system is the most recent, gold and without a check valve. The barrel nut, I tighten until it stops ( Is this correct?). I ordered a gas replacement assembly and all parts are identical to the original firearm. I replaced the o-ring with a factory spec - BUT - I ordered two and the dimensions of the replacements are not identical. Close BUT not exact. Completely out of the loop with the ability to identify short action guns, short action adapters, long action barrel and long action bolts. Thanks for the reply.

The Spare parts list, Table 3 (gas system), shows the Break Action Magazine damper and codes it as Part # 299W. Original .308 barrel. Clean with "Wipe Out". Oil the bolt and rotating head. I've completely dis-assembled the gas system after the issue began to clean the two pieces of the Piston Extension assembly. Use 168 grain cartridges, Barnes and Hornady A-Max. 165 grain Remington Sirocco. Federal 180 grain Trophy bonded. Test fired 15 cartridges last week and the bolt does not remain open after the last cartridge is fired so existing issue not resolved. I purchased the Break Action Magazine damper from the Canadian source for Benelli firearms. Haven't a picture at the moment but shown in part breakdowns on USA web sites.

A drill bit of appropriate size with tap on the cutting edge to protect your fingers, gloves etc.

The break action magazine damper is a piece of rubber (round on one end tapering into a point with a recessed area to allow seating when inserted into the hole at the bottom of the Pin Shoulder Plate ). This item interferes/cushions the Piston prior to contact with the bolt follower pins. I've fired the rifle without this item as it disintegrated. The bolt remains open 10% of the time when all rounds are fired without this item. Just purchased and installed a replacement today. Haven't test fired the rifle yet, rain and mosquitoes. Not certain if replacing this item will successfully keep the bolt open after the last cartridge has been fired. Anyone have experience with this DAMPER?