.22 LR adaptor barrel for Enfield rifle

[m1903rifle]

I'm looking for information regarding a .22 LR adaptor barrel for an Enfield Rifle. It comes with a bolt with the off set firing pin that appears that it would work with the barrel.

Information

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[Peter Laidler]

I have the drawings and an idea for such a beast but I'm not sure one exists out there. I have bandied the idea about on the forum so maybe that's where you heard about it

[gsimmons]

Numrich had them. They do have the .22 bolt heads.

[Steve H. in N.Y.]

Numrich still lists them as product # 502970. Made in India or thereabouts, the one I had years ago was poorly done with DP bolt parts. Not accurate at all although I understand some people had better luck with theirs. I'd suggest spending a little more money and buying a .22cal. No.2 rifle.

[bigduke6]

m1903rifle, I second what Steve says, I,ve dabbled with liners and adapters, and find it easier to produce a barrel of the required calibre or buy a complete rifle.

link below will gives the best info regarding adapters aiming tubes.

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[Peter Laidler]

There's a real killing to be made for someone who makes one of these inserts with a replacement bolt as a kit. An insert that remains in place when you extract the epent case as well. Easy but.........

[rickv100]

I think you are asking about a Morris tube conversion.

Rick

[Bruce_in_Oz]

Yep, definitely sounds like a Morris Tube.

Initially, that is exactly what they used, a TUBE that slid into a standard barrel.

Obviously, a suitably offset striker was required. Hence a substitute bolt assembly. These had the striker ground off back to the collar and a floating offset striker in a specially made bolt head. The final feature is the special narrow but deep reaching extractor.

Problems with the removable tubes arose from a number of directions:

These tubes were THIN and thus fragile .

The also were only to be used with low-pressure, Standard" velocity ammo, for two reasons:

Most of these rifles were being used in indoor and outdoor "gallery" ranges; hence low velocity ammo for less "travel" and less noise. Paper targets at 25 yards hardly require "hot" loads.

The real problem came from the fact that the "barrel" walls were rather thin. This is the other reason NOT to use them with high-velocity ammo: the thin-walled tubes may expand and become sort-of "permanent" features. (.303" -.223")/2 leaves a MAXIMUM possible wall thickness at the grooves in the tube of 0.040" (1mm) wall thickness.

In later developments, the Heckler and Koch "sub-cal" kits for the G1 / L1A1 were subject to similar constraints.

Back in the "good old days", I had one of the US issue subcal kits for the M-16, It worked very well in an early SP1 sporter with its 1: 12" twist, but was useless in the HBAR 1:7" twist which basically stripped the bullets in the tight rifling.