Live Fire: Bren Mk1 (Modified)

Introduce in British service in 1938, the Bren remained in use into the 1990s. Based upon the Czechoslovakian series of ZB light machine guns, its name comes from an amalgamation of its origins: BR for Brno, the factory in Czechoslovakia, and EN for RSAF Enfield where it had been adapted for British service and was to be produced.

The Bren is chambered in .303, is gas operated and fires from an open bolt. It feeds from a top-mounted 30 round box magazine, as such the sights are offset to the left meaning the Bren can only be fired from the right shoulder – which as a lefty, I quickly realised.

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Bren Mk1(Modified) (Matthew Moss)

This example does not have the scope mounting dovetail machined into the left side of its receiver, or the folding grip and the hinged shoulder rest indicating that it is a Mk1 (Modified) ‘Pattern A’ gun, which was introduced after the evacuation of Dunkirk, the British Expeditionary Force lost most of the 30,000 Brens that had been taken to France. Only around 2,000 remained in inventory in the summer of 1940, so increasing production was essential, this model and the even more simplified MkII were introduced. While at the same time the BESAL light machine gun was developed as an emergency alternative by BSA – check out our earlier video on the BESAL here.

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The BSA-developed BESAL light machine gun (Matthew Moss)

As a Mk1, the gun has the original profile buttstock, with the fitting for a rear folding grip and tripod attachment point as well as a buttcap. It also has the drum rear sight rather than the later ladder sight of the Mk2 & 3. It also had a folding cocking handle and this Mk1(M) gun also has the earlier pattern height adjustable, rather than fixed, bipod legs. This gun is marked ‘MK1, with an E within a D, 1942’ indicating it was made at RSAF Enfield.

 

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Bren Mk1(Modified) with magazine off and dust cover closed, note the drum sight but lack of receiver cut for optic (Matthew Moss)

The Bren’s relatively slow rate of fire (of around 500 rounds per minute) makes it controllable and very easy to fire single shots while in full auto. The Bren does, however, have a selector on the left side of the gun, just above the trigger guard, which can be set to safe, semi or fully automatic. The Bren has a rocking recoil impulse as its heavy bolt moves back and forth, easily manageable if held tightly into the shoulder with the off-hand holding onto the wrist of the stock. The top-mounted magazine when fully loaded does have a tendency to want to fall to the side but once you’re used to this it’s not really an issue. The legend surrounding the accuracy of the Bren is certainly somewhat valid, at the time it was recognised as an accurate weapon and I found it accurate from my short time behind the trigger.  I found the Mk1’s rear sight aperture and drum adjustment easy to use.

Spent cases eject out of the bottom of the receiver, the weapon had a sliding dust cover for when the magazine was removed and the charging handle is non reciprocating and folds forward.

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Bren Mk1(Modified) with magazine off, dust cover closed and barrel removed (Matthew Moss)

The Bren has a quick change barrel system. To remove the barrel the release catch in front of the magazine was rotated upwards to unlock and then the barrel was rotated 90 degrees clockwise by bringing the carrying handle up to the 12 o’clock position and then sliding it forward.

We’ll have a more in-depth look at the Bren and its Czech predecessors in the future. My thanks to my friend Chuck over at Gunlab for letting me put some rounds through his Bren, I got a real kick out of it!


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