soulboy1957 Posted June 29, 2020 Report Share Posted June 29, 2020 I have a Laporte o/U 12g fully moderated, this gun is a fabarm. Unfortunately it does not fire the second barrel due to insufficient recoil to set the inertia block. A thump on the recoil pad does it, I'm thinking maybe a heavier shot load, have been loading 1oz,would increasing this to 1 1/4 oz increase recoil? Any ideas, bit stuck on this one. Quote Link to comment Share on other sites More sharing options...
steve_b_wales Posted June 30, 2020 Report Share Posted June 30, 2020 8 hours ago, soulboy1957 said: I have a Laporte o/U 12g fully moderated, this gun is a fabarm. Unfortunately it does not fire the second barrel due to insufficient recoil to set the inertia block. A thump on the recoil pad does it, I'm thinking maybe a heavier shot load, have been loading 1oz,would increasing this to 1 1/4 oz increase recoil? Any ideas, bit stuck on this one. A heavier load would probably do it. Whether the extra 1/4 oz would be sufficient remains to be seen. Quote Link to comment Share on other sites More sharing options...
oldypigeonpopper Posted June 30, 2020 Report Share Posted June 30, 2020 Hello, what model of fabarm, ? I would have thought if they are made with inertia system it should work with all 12 gauge loads? Quote Link to comment Share on other sites More sharing options...
Gunman Posted June 30, 2020 Report Share Posted June 30, 2020 You have a gun that has been modified beyond the makers spec . You could try heavier loads but whether you need to go up to 1&1/4 remains to be seen . Have you spoken to the people who did the modifications as I would have thought it was there responsibility to see the gun worked or gave recommended loads . Quote Link to comment Share on other sites More sharing options...
soulboy1957 Posted June 30, 2020 Author Report Share Posted June 30, 2020 Hi, it's based upon the Fabarm Gamma, sold as a LA Porte swing trap fully moderated. I wonder if it's possible to decrease the spring tension on the inertia block, thereby allowing it to fall back and engage the 2nd sear with subsonic loads. Seems strange as it was marketed as such. The original design is very good, a high quality action, barrels and stock with well made moderator, however not that quiet compared to my 20g o/U hushpower, the reason being the barrels were not ported, this has now been done and is now fairly quiet. Before porting After porting Quote Link to comment Share on other sites More sharing options...
Ultrastu Posted June 30, 2020 Report Share Posted June 30, 2020 Reproof ? Quote Link to comment Share on other sites More sharing options...
lancer425 Posted June 30, 2020 Report Share Posted June 30, 2020 I had a Laporte swing trap and i used many different subsonic loads including some with fast burning red dot powder, and i never had a single issue with the trigger inertia tripping. Try loading a heavier load, but it could be the mechanism is short of some maintenance and cleaning. . Quote Link to comment Share on other sites More sharing options...
Gunman Posted July 1, 2020 Report Share Posted July 1, 2020 Has it been reproofed since some one drilled holes in the barrels ?? Quote Link to comment Share on other sites More sharing options...
Guest cookoff013 Posted July 1, 2020 Report Share Posted July 1, 2020 make 42g subsonics. thats 1.5oz in old money Quote Link to comment Share on other sites More sharing options...
soulboy1957 Posted July 1, 2020 Author Report Share Posted July 1, 2020 The question was about the inertia block working, but especially for the gun police, yes its been re proofed. I'll try upping the shot charge and powder (maxam CSB5) Thanks for all the replies so far. Quote Link to comment Share on other sites More sharing options...
swan40 Posted July 2, 2020 Report Share Posted July 2, 2020 Not an x- spurt but I would suggest that the spring needs changing to a lighter one just like you have to do if you use .410 tubes in a 12 bore to shoot nssa skeet (1/2 ounce load)- common problem with non mechanical triggers . A proper gunsmith ( not gun seller )would soon help you. I have shot the type of gun you have - nearly bought one - I must say they look some good size holes you have put in those barrels would be interested to know how it all works out. Good luck with it . Quote Link to comment Share on other sites More sharing options...
Guest cookoff013 Posted July 2, 2020 Report Share Posted July 2, 2020 On 01/07/2020 at 15:40, soulboy1957 said: The question was about the inertia block working, but especially for the gun police, yes its been re proofed. I'll try upping the shot charge and powder (maxam CSB5) Thanks for all the replies so far. Wow. Dont up the powder charge ! Not with fast powders. Itll just end up loud Quote Link to comment Share on other sites More sharing options...
soulboy1957 Posted July 2, 2020 Author Report Share Posted July 2, 2020 Thanks guys, it seems LA Porte almost got it right, full length moderator, 8 inches of baffling at the end, just didn't port the barrels to lessen the powder blast, having looked at my 20g o/U hushpower and my mates 12g mossberg, the hole size is 6mm with 50mm spacing. Anyway it's done the trick and is now fairly quiet, the inertia system now works with 16.5 grains of Maxam CSB5 and 1/1/8 of no 5's, chronographed at 1020 fps tonight. Thanks Mark Quote Link to comment Share on other sites More sharing options...
sitsinhedges Posted July 3, 2020 Report Share Posted July 3, 2020 The porting should begin several inches from the breech. Is that the case? Quote Link to comment Share on other sites More sharing options...
soulboy1957 Posted July 3, 2020 Author Report Share Posted July 3, 2020 Yes, 26 inch barrels, porting starts at 14 inches, CSB5 burns clean. Quote Link to comment Share on other sites More sharing options...
figgy Posted July 4, 2020 Report Share Posted July 4, 2020 The gun police as you call them are only looking out for you and your safety fella. Personally I'd strip and clean the gun and lube the slide rails with drop or two of a good oil along with oiling the inertia spring. I've had benellis when new wouldn't run standard carts dry without being oiled it failed to cycle untill well run in. Quote Link to comment Share on other sites More sharing options...
soulboy1957 Posted July 4, 2020 Author Report Share Posted July 4, 2020 4 hours ago, figgy said: The gun police as you call them are only looking out for you and your safety fella. Personally I'd strip and clean the gun and lube the slide rails with drop or two of a good oil along with oiling the inertia spring. I've had benellis when new wouldn't run standard carts dry without being oiled it failed to cycle untill well run in. Thanks figgy but it's an O/U not a semi auto, I've had that issue with my M2 when it was new, this is with regards to the inertia system on a single trigger Fabarm Gamma over and under. Quote Link to comment Share on other sites More sharing options...
figgy Posted July 4, 2020 Report Share Posted July 4, 2020 AHH I see now. Inertia block not moving after first shot. Have you tried hitting the butt pad to see if it resets for next shot. Quote Link to comment Share on other sites More sharing options...
WalkedUp Posted July 5, 2020 Report Share Posted July 5, 2020 On 29/06/2020 at 23:32, soulboy1957 said: A thump on the recoil pad does it Yes it does ^ Quote Link to comment Share on other sites More sharing options...
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