Boys Anti-Tank Rifle List of Changes Document

The Enfield designed BOYS ANTI-TANK RIFLE in .55 calibre

846
SECTION B 1
B 2751
RIFLES, BOYS, MK. I
Sears, Mk. II
Springs, sear, Mk. II

New patterns.

Sears, Mk. I
Springs, sear, Mk. I

Nomenclature.

Obsolescent.

30th June,
1939
57 Vocab.
835

The above-mentioned new patterns have be

future manufacture.
A brief description is given hereunder—
The Mk. II sear differs from the Mk. I pattern (i the bent is stepped to control the engagement of 'the cocking-piece and to facilitate manufacture, the right undercut instead of recessed.
The Mk. II sear spring differs from the Mk. I pat has an upward set commencing approximately 5-in. fr. hole. This pattern can be used with either Mk. I or Mk`
With the Mk. II sear the Mk. II spring must be used.

Consequent upon 1, the nomenclature of the origin sear spring (i B 2750) is hereby amended to read as shown

The Mk. I sear and spring are hereby declared Existing stocks will be used up.

B 2752
RIFLES, BOYS, MK. I
Washers, screw, recoil reducer

Introduction.

Fitting to rifles locally.

24th Mar.,               1. The above-mentioned store has been approved for
1039          the heads of recoil reducer screws of Rifles, Boys, Mk. T
70              The washers are of "Shakeproof " pattern to prevent
B.A.         becoming loose.
261                   2. All rifles will be fitted locally with these 'washers Vi
67            supplied, as under, to officers concerned. on demand. Vooab.
835
Section L.V. 6—M.T. 5
Pt. No.
15414              Washers, lock, shakeproof,

966

                                                                        SECTION B 1

B 2852

RIFLES, BOYS, MK. I

31st March,
1939
57
S.A.
1080

Corps marking.

Approval has been given for the marking of corps marks on the above-mentioned Rifles (§ B2750). The mark will be carried out locally in accordance with Equipment Regulations Part I, and will be placed on the right side of the rear yoke of the cradle as shown on the accompanying sketch.

Note: - Stamps, steel, for metal, 5/64-in. for figures and letters, (Section F), as used for marking service arms will be employed for this work also.

SECTIONS Q 1 AND Q 2

B2245

CARTRIDGES, S.A.

For Boys rifle

Armour-piercing, • 55-in., W, Mk. I L
11, • 55-in., Mk. I

Ball, practice, • 55-in., P

MK.I

MK. II L

Drill, • 55-in., D, Mk. I L

Dummy, • 55-in., II, Mk. I

For use of Inspectors and armourers L

Introduction.

Mk. I practice ball cartridges obsolescent.

Drawings (D.D. (L) 7416, 7818, 7933, 8763, 8559 and D.D. (L)

7875 respectively) of the above-mentioned cartridges have been sealed to govern manufacture for Land Service. The armour-piercing cartridge consists of a brass case containing charge of approximately 186-gr. of cordite M.D.T. 7-2, percussion

can and bullet.

The case is of the belted type tapering slightly towards the mouth and is bored out at the base to form an anvil and a chamber for the percussion cap. Two fireholes connect the cap chamber to the interior of the case.

The cap is of brass and contains from 1.4 to 1.6-gr. of cap C1:-

The bullet consists of a steel envelope coated with cupro-nickel

and contains a lead sleeve with a steel core.

Two grooves are formed round the bullet for attachment of the case, the mouth of the latter being coned on to the upper groove and indented to the lower groove in three places.