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BOYS ANTI-TANK RIFLE
A " .50 cum .22" BMG (Browning Machine Gun) CALIBRE CONVEYOR - ADAPTER FOR SUB-CALIBRE PRACTICE IN TRAINING
and a link to the incorrectly titled "BOYES' Small Arms Training Pamphlet of 1937-39"
For the Boys ATR converted to .50 calibre BMG
A Rimless Conveyor "cartridge", with Firing-Plug and its striker in the white
The chamber below shows the spring circlip groove that holds the striker plug in position when inserted into the conveyor.
The two-part firing-plug, showing the firing-pin section and "primer" cover
into which it fits with another locating circlip.
< Head & Chamber shown left.............................. - .......................... Muzzle shown right>
The components, in their correct configuration for use,
and in place ready for loading and firing.
The firing-plug/striker is brought flush with head of the conveyor when a .22RF round is chambered
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Below is the Parker-Hale catalogue advertisement drawing for the the ".55 cum .22" for the Boys ATR in its original .55 calibre, with belted cartridge case, and manufactured by that company during WWII, shown for comparison. Note the expeller rod necessary for pushing the fired cases from the conveyor.
Below, a 5 round group firedwith the .50 BMG conveyor at only 8 yards for testing. The point of impact is three inches low and right, the aiming mark having been the top left hand target black, with the Boys' rear-sight set at 300 yards. A five hundred yard setting would lift the group a little. Windage is good, but elevation was probably affected by old eyes looking through a large battle aperture at an out-of -focus fore-sight-blade, for a blurred and inconsistent six-o'clock aim. The three round key-holed group is probably most representative of performance. The target is shown larger than actual size. The bullet holes are, of course, .22 calibre.
Return to the Boys Anti-Tank Rifle
See also the "303 cum 22" Rifle Pattern 1918 by Parker-Hale
Click here for Chronology of Enfield genre Training Rifles, Adapters & Cartridges
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