BSA double sear project, latest progress, new questions.

[edbear2]

I don't have a sloppy fit as such although when tight the block does go a fraction past the "home" position, backed off a fraction so the screws will thread it's all fine unless I set them as tight as the ought to be. ??

Really daft question, but have you done them up with the block off and looked down the spring guide to make sure they are not a fraction too long ?.....these screws can strip and can be replaced with 2BA screws, if done well this is hard to spot and obviously the replacements can be longer.

If you measure them and post on here people could tell you if the correct length.

ATB, ED

[stevegv8]

Really daft question, but have you done them up with the block off and looked down the spring guide to make sure they are not a fraction too long ?.....these screws can strip and can be replaced with 2BA screws, if done well this is hard to spot and obviously the replacements can be longer.

If you measure them and post on here people could tell you if the correct length.

ATB, ED

I will look into that, also update on my post above, the block actually threads in by just less than a quarter turn past the central position when tight so is backed off some amount for fitting trigger guard and screws which then lock the trigger when they are tight, so will look into their length.

[edbear2]

I will look into that, also update on my post above, the block actually threads in by just less than a quarter turn past the central position when tight so is backed off some amount for fitting trigger guard and screws which then lock the trigger when they are tight, so will look into their length.

Hi Steve,

It's quite common for the blocks to rotate past the lining up point, 1/4 turn seems quite a lot but have seen similar.

ATB, Ed

[stevegv8]

The latest news on this project.
I had dry assembled this project (well not dry but for test purposes) and found the trigger sticking if the trigger block screws were screwed down tight.
It was suggested they maybe too long and did look like good aftermarket copies (clean and not damaged) so I ground a threads length off but still the same? Additionally though it wouldn't latch up, big dilemma after the whole project was about fixing the double sear.
Thinking back it latched with the screws loose so I put them in with no trigger guard at all too see if it was worse thinking I could check if more needed to come off the screw length.
However the trigger didn't stick at all! so now it seemed the fault was only with the guard tightly fitted.

Looking closely at the trigger blade I could now spot that it bottomed out onto the guard and this meant when tight the sears could not reach upto the correct point of the rod which was extending a fraction short, with it loose they could meet but the trigger was sticking and no guard it worked fine.

So some carefull dressing of the contact point on the trigger lowest point where it wouldn't be visible and a bit of cold blue after and the gun works a treat at last.
I set the trigger with short pull then backed off a bit so as not to fire if jolted, a lighter trigger spring and feels fairly good finally.

New leather washer supplied by DCL_dave fitted to it and all done I hope.

Can't do a detailed chrono as the Caledonian pellets I use I don't know the weight of but wild guessing .85 grams it shows only 6 ft lbs on it's first 5 virgin shots, needs to bed in no doubt but wasn't looking for power I just wanted it to work and it's still on it's old spring after all which I might replace but happy for now.

[DCL_dave]

Hi Steve,

This site, although not updated now...is handy for pellet weights and the power calculator https://extorian.co.uk/shooting/pellets.html

[edbear2]

If it is a 43 inch length gun, they can go 725 FPS but most are mid/high 600's I have found if that helps......these figures with Wasps and a tad more with Meisterkugeln etc. type match pellets which they often like, Hobby being a good choice quite often.

ATB, ED

[stevegv8]

Nice useful link from DCL_dave 2 posts above, thanks.

My guess was quite good, out by .01 gram. So reset test and get 445.5 fps 6.138 ft/lbs short of fitting a spring that's about it, I collect & rarely get to plink sadly so don't really need more power, just wanted it working.
I think out of interest I may eventually do a spring one day subject to sourcing the correct item, best places to enquire?