10/22 magnum Sporter project

[Ruger8r]

So, went back to the range with some Federal ammo but only saw a marginal improvement. But I was shooting from a folding table shared with another shooter at a club shoot. A problem cropped up with trigger; every few rounds the trigger would lock forward as if the safety was on. Cycling the bolt, ejecting a round, would clear it. I haven't looked into it yet - might be a lubrication problem. Any suggestions?

I acquired another donor gun to make that Feddersen bull barrel Sporter. It has a 21 3/4" Clark bull barrel in .17 HMR mounted in a Boyds laminated thumbhole stock. It was described by the seller as being set-up as a single-shot but it doesn't have the typical lock and release mechanism. What it does have is a very strange aftermarket trigger assembly that bears little resemblance to any 10/22 trigger group I've ever seen. The safety is behind the trigger and the internals are all different, including what looks like an adjustment screw. The bolt lock-back mechanism is very different. I hope someone can identify it. Here are some photos:

UPDATE: After spending some time with that trigger assembly, partially disassembling it to free-up the stuck bolt lock-back mechanism, it appears that it is not designed for single-shot use but, because it has a much stronger hammer spring, it is designed to mitigate the higher blow-back energy of the .17 HMR round in semi-auto operation. Cycling the bolt is much more difficult than with an OEM style trigger group.
This 2004 receiver has the same cast-in markings as the one from 2001 (E in a circle and A in a rectangle). It also has a single extractor bolt although it could have been switched out because the exposed side has been jewelled.
UPDATE II: The firing pin has been pinned so, apparently, this bolt was sent to CPC (Connecticut Precision Chambering) for modification. Unfortunately, it seems Randy has closed his shop.

[Ruger8r]

So, got both rifles sorted out after switching out the receiver assemblies, looking for better groups from the scoped gun, and replacing both firing pins due to light strikes from worn pins. Groups did shrink a bit with the switch. I really like those Sporter stocks.

A rimfire central member identified the trigger assembly as being a very early Jard product. The company verified that but couldn't give me any more information and won't service it. Oh, well.

I went with a BX trigger on the bull barrel custom to save a little weight.

I was surprised that both iron sight barrels from Feddersen (.22lr and .22mag) were off quite a bit from the factory and required big adjustments of the rear sight.