The $100 challenge.....

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Posted: 27 Aug 2023 at 8:29pm

Polish sear decide if you want to shorten the contact faces, use graphite, weaken main spring, design and add another sear to give a mechanical advantage.
I'm going to shorten the sear face height a bit more again. Easiest way I can see. Concentrate on my trigger pull with this umm unique system.
Was contemplating filing the sear, so last bit before disengaging piston would allow a small click feeling as the piston moved forward a mm or two.
Figured the edge would round to fast where it stepped down.
Thats all my thoughts from limited my experiance.

KiwiTR6

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Posted: 27 Aug 2023 at 5:47pm

a bit more progress than I'd anticipated and some more questions answered. The peened over end of the pivot bolt was quite hard and took a bit of work to remove. The bolt itself was also super tight so I resorted to using and impact driver rather pushing on with a screwdriver and wrecking the head.

The cylinder outside is very slightly barrel shaped, so no straightening required. The inside surface is amazingly clean and smooth but the 1.0" plastic seal has sustained some damage to the sealing edge due to some stray metal filings at the breech end. I'll obviously clean this out and remove any sharp edges I find and then see if I can find a more flexible seal to suit from somewhere.

The trigger spring seems far too long as Kruz said, I'm sure I can find something more suitable but I have no idea what I need to do to improve the trigger - so any advice would be much appreciated.

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mercs

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Posted: 27 Aug 2023 at 4:29pm

What to compare the AC Junior against.

I have chosen Crosman Raven ($199) genuinely a youth rifle because it said so on the box.

Bought out into the light from the back of the gun safe and Gamo 4x32 scope fitted to be consistent.

I feel this is a much nicer rifle to shoot and was very surprised with the resulting 35mm OD group same as the AC Junior. Standing is not my position of choice so I repeated the test and got a 40mm OD for my trouble. On that my AC junior may actually stack up as a low cost youth rifle, except for the bloody trigger. I could shoot the Crosman all day, but the AC just plain hurts, so trigger is next point of interest for me.

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Posted: 27 Aug 2023 at 4:15pm

Thats cool, many many rifles around the world could have done with that solution over the years. They are a great adaptor rail and mine has also been taken to with hacksaw and file for different projects.

The pivot and effective detent mechanism is always worth attention on a new break barrel and normally an immediate warranty return if any doubts.

My Nikko Stirling red dot vertical adjustment is normal but windage is the opposite to the markings which I removed to prevent confusion.

Great stuff

KiwiTR6

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Posted: 27 Aug 2023 at 3:19pm

A definite improvement on what I was getting yesterday! I'm strugglinfg to make sense of the adjusters on the red dot, but the groups are OK I think. The trigger is aweful, sometimes I can feel an initial set and it fires with a little more pressure, other times no set and a lot of pressure required and it fires unexpectedly.

I've included some photos of the modified picatinny adapter I used and the cutouts I had to add to allow clearance for the barrel.

FX Wildcat MK111 BT Sniper .25
FX Dreamline Classic .22
Diana Outlaw .22
Cometa Fenix 400 .177
Weihrauch HW50 .177
Crosman 2240 PCP Custom .22
Crosman 2250 PCP Custom .22
Brocock Grand Prix .22

KiwiTR6

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Posted: 27 Aug 2023 at 12:29pm

I can see a couple of issues other than the pivot. I've got some shims so once I've taken it apart I'll look at the pivot as well, but the latching mechanism isn't particularly positive and the breech seal protrudes and is so firm that it also affects the alignment when loaded.

I'm fairly close to getting the scope mounted, just a couple of mods needed to the mounting bracket to allow the barrel to pivot fully and cock. Should be able to produce some test results today some time.

FX Wildcat MK111 BT Sniper .25
FX Dreamline Classic .22
Diana Outlaw .22
Cometa Fenix 400 .177
Weihrauch HW50 .177
Crosman 2240 PCP Custom .22
Crosman 2250 PCP Custom .22
Brocock Grand Prix .22

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Posted: 27 Aug 2023 at 11:11am

Sounds very likely. So do you think if the locking pin for the barrel was thickened or some sort of shim that it would hold the barrel steadier vertically.

KiwiTR6

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Posted: 27 Aug 2023 at 10:43am

OK guys, this is what I think could be my problem. Nothing to do with the banana cylinder, but I will straighten that in due course with my little hydraulic press and wooden blocks with cutouts to match the OD.

With the factory fixed sights the shooting line is correct (despite it masking the target) regardless of the barrel location, hence the reasonable groupings I was achieving when I started. However, the scope is fixed to the cylinder and I think the slack in the pivot and possibly other factors means the barrel is not locking into the same position each time the gun is loaded, hence the inability to achieve grouping of any sort. I imagine the deviation is both vertical and lateral.

My plan is to fit an adapter rail onto the barrel where the rear sight normally locates. There's only two fairly shallow 4mm threaded holes to work with but they should be enough for a trial at least. To that I'll connect the Hawke red dot off the wife's Cometa and see If I can get it to group again. The red dot will work as it's visible with a huge range of eye relief. I wouldn't be able to do it with anything else other than a more refined fixed sight setup.

If this proves my point, then some serious work is going be needed to ensure the barrel locks in place true and consistent every time in order to continue with a normal scope setup.

I hope to be able to post some results in the next day or so.

Edited by KiwiTR6 - 27 Aug 2023 at 10:44am

FX Wildcat MK111 BT Sniper .25
FX Dreamline Classic .22
Diana Outlaw .22
Cometa Fenix 400 .177
Weihrauch HW50 .177
Crosman 2240 PCP Custom .22
Crosman 2250 PCP Custom .22
Brocock Grand Prix .22

kruzaroad

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Posted: 27 Aug 2023 at 10:30am

Good point Pete. I know when I looked at my stock I had 3points of rubbing (none which I've taken care of yet.)
All at rear of reciever, which I wondered at the time if it was holding the cylinder above the vast majority of the ribs on stock.
Wouldn't surprise me if bad fit to stock is part of the issue with them.

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