77/22 breech block-where to buy?

5015 Views 30 Replies 13 Participants Last post by blkwollf, Jan 31, 2017

flashbang

Discussion Starter · Apr 11, 2003

I need a 77/22 22lr. breech block to convert from 22mag. to 22lr. but no one seem to sell them.
Any ideas?

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flashbang

Discussion Starter · #21 · Oct 31, 2006

Someone throw me a bone for the love of baby Jesus!!!

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don't know if this counts as a "bone", but...

i've been shooting 17m2, 17hmr, and 22 mag out of my model 77 (originally chambered in 17 hmr) without changing trigger guards or breech blocks.

check here:

http://www.jesseshunting.com/forums/index.php?showtopic=73585&hl=

if you read the post, you'll learn how to modify the "cartridge support" (not extractor claw) so that it holds a 22 lr case (either 22 lr or 17 m2) in place while still using a "magnum" breech block.

hope this helps you out.
-rusty22

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flashbang

Discussion Starter · #23 · Oct 31, 2006

Rusty22
Thank you for the info, I have some questions.

"Clerke machines a .007" thick shoulder on the breech face of the barrel to make up for proper headspacing of a 22 LR case fire with a 22 mag bolt."

Does this have to be done in addition to the CS mod?

"I also modified the cartridge support to improve the extraction because the cartridge support was originally tuned for 17 HMR (22 mag case). Once this mod is done, extraction and feeding is better for all rimfire calibers."

Will the 22Mag case function with this mod, or once modified it will only work for 22RF?

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rusty22

· #24 · Oct 31, 2006

it's all up to you...

the .007 " shoulder definitely helps with "lock up" and addresses the issue of reliable ignition due to light firing pin strikes.

i don't think it's necessary in most cases.

as far as modifying your cartridge support, once done, your bolt will be able to handle both magnum based cases (17 hmr,22mag) and lr based cases (22lr,17m2) without swapping out the breech block.

trust me, you'll have an easier time ordering the cartridge supports from ruger versus finding a spare magnum breech block, whether it be used or new.

good luck,
-rusty22

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Chief Dave

· #25 · Oct 31, 2006

BillB said:
In .22LR/.17HM2 and .22WMR/.17HMR case heads....

How does the Sako Quad rifle, with four barrels/four calibers and one bolt (boltface), handle this situation?

Regards Bill

my 96/22mag will run both mag and LR size cases just fine as is....check what you have before you try to fix it!

cletus