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CZ LONG ARMS => CZF RIMFIRES => Topic started by: Warpspasm on July 11, 2017, 03:19:32 PM

Title: Picked up a .17HMR barrel kit for my 455. Gunsmith fitting needed? Really?
Post by: Warpspasm on July 11, 2017, 03:19:32 PM

I have a 455 Tacticool that I wanted to try a .17HMR varmint barrel on and it was on sale at CZ USA, so I bought one. It showed up today and I was all excited about swapping out the .22lr barrel and going to the range. One of the first lines in the directions says it must be fitted to the rifle by a gunsmith. I thought they were drop in kits. Do they REALLY need to be fitted or is this CZ making sure they cover themselves for liability reasons?

Title: Re: Picked up a .17HMR barrel kit for my 455. Gunsmith fitting needed? Really?
Post by: viking499 on July 11, 2017, 03:53:06 PM

You have a "gun" and your new nickname is "Smith".  Put the barrel in there and have at it. ;)

Should not be any problems.  Might take a little playing with the screws to find the torque the HMR barrel likes.

Title: Re: Picked up a .17HMR barrel kit for my 455. Gunsmith fitting needed? Really?
Post by: painter on July 11, 2017, 08:04:25 PM

WRT the barrel screws. The published spec is really over the top. 35 in/lb is all that's needed.

Title: Re: Picked up a .17HMR barrel kit for my 455. Gunsmith fitting needed? Really?
Post by: Warpspasm on July 11, 2017, 08:47:18 PM

I was surprised when I read the torque specs. Especially the 6 NM for the stock. That's something like 54 in/lbs!

Title: Re: Picked up a .17HMR barrel kit for my 455. Gunsmith fitting needed? Really?
Post by: painter on July 11, 2017, 09:58:41 PM

25 in/lbs max on the action screws, or you'll crush the wood and bend the bottom metal.