The United Kingdom produced its own variant of the FN FAL incorporating the modifications developed by the Allied Rifle Committee, designating it the L1A1 Self Loading Rifle (SLR).
The weapons were manufactured by the Royal Small Arms Factory Enfield, Birmingham Small Arms, Royal Ordnance Factory and ROF Fazakerley.
After the production run ceased, replacement components were made by Parker Hale Limited.
The SLR served the British Armed Forces from 1954 until approximately 1994, being replaced by the L85A1 from 1985 onwards.

The SLR was designed using Imperial measurements and included several changes from the standard FN FAL.
A significant change from the original FAL was that the L1A1 operates in semi-automatic mode only.
Other changes include: the introduction of a folding cocking handle; an enclosed slotted flash suppressor; folding rear sight; sand-clearing modifications to the upper receiver, bolt and bolt carrier; folding trigger guard to allow use with Arctic mitts; strengthened butt; enlarged change lever and magazine release catch; vertical stripping catch to prevent unintended activation; deletion of the automatic hold-open device and the addition of retaining tabs at the rear of the top cover to prevent forward movement of the top cover (and resulting loss of zero) when the L2A1 SUIT was fitted.
The flash suppressor is fitted with a lug which allows the fitting of an L1-series bayonet, an L1A1/A2 or L6A1 blank firing attachment or an L1A1/A2 Energa rifle grenade launcher.

Initial production rifles were fitted with walnut furniture, consisting of the pistol grip, forward handguard, carrying handle and butt.
The wood was treated with oil to protect against moisture, but not varnished or polished.
Later production weapons were produced with synthetic furniture.
The material used was Maranyl, a nylon 6-6 and fiberglass composite.
The Maranyl parts have a "pebbled" anti-slip texture along with a butt has a separate butt-pad, available in four lengths to allow the rifle to be fitted to individual users.
There was also a special short butt designed for use with Arctic clothing or body armour, which incorporated fixing points for an Arctic chest sling system.
After the introduction of the Maranyl furniture, as extra supplies became available it was retrofitted to older rifles as they underwent scheduled maintenance.
However, this resulted in a mixture of wooden and Maranyl furniture within units and often on the same rifle.
Wooden furniture was still in use in some Territorial Army units and in limited numbers with the RAF until at least 1989.

The SLR selector has two settings (rather than the three that most metric FALs have), safety and semi-automatic, which are marked S (safe) and R (repetition.)
The magazine from the 7.62 mm L4 light machine gun will fit the SLR; however, the L4 magazine was designed for gravity assisted downwards feeding, and can be unreliable with the upwards feeding system of the SLR.
Commonwealth magazines were produced with a lug brazed onto the front to engage the recess in the receiver, in place of a smaller pressed dimple on the metric FAL magazine.
As a consequence of this, metric FAL magazines can be used with the Commonwealth SLR, but SLR magazines will not fit the metric FAL.

Despite the British, Australian and Canadian versions of the FAL being manufactured using machine tools which utilised the Imperial measurement system, they are all of the same basic dimensions.
Parts incompatibilities between the original FAL and the L1A1 are due to pattern differences, not due to the different dimensions.
Confusions over the differences has given rise to the terminology of "metric" and "inch" FAL rifles, which originated as a reference to the machine tools which produced them.
Despite this, virtually all FAL rifles are of the same basic dimensions, true to the original Belgian FN FAL.
In the US, the term "metric FAL" refers to guns of the Belgian FAL pattern, whereas "inch FAL" refers to ones produced to the Commonwealth L1A1/C1 pattern.

SLRs could be modified at unit level to take two addition
The United Kingdom produced its own variant of the FN FAL incorporating the modifications developed by the Allied Rifle Committee, designating it the L1A1 Self Loading Rifle (SLR). The weapons were manufactured by the Royal Small Arms Factory Enfield, Birmingham Small Arms, Royal Ordnance Factory and ROF Fazakerley. After the production run ceased, replacement components were made by Parker Hale Limited. The SLR served the British Armed Forces from 1954 until approximately 1994, being replaced by the L85A1 from 1985 onwards.
The SLR was designed using Imperial measurements and included several changes from the standard FN FAL. A significant change from the original FAL was that the L1A1 operates in semi-automatic mode only. Other changes include: the introduction of a folding cocking handle; an enclosed slotted flash suppressor; folding rear sight; sand-clearing modifications to the upper receiver, bolt and bolt carrier; folding trigger guard to allow use with Arctic mitts; strengthened butt; enlarged change lever and magazine release catch; vertical stripping catch to prevent unintended activation; deletion of the automatic hold-open device and the addition of retaining tabs at the rear of the top cover to prevent forward movement of the top cover (and resulting loss of zero) when the L2A1 SUIT was fitted. The flash suppressor is fitted with a lug which allows the fitting of an L1-series bayonet, an L1A1/A2 or L6A1 blank firing attachment or an L1A1/A2 Energa rifle grenade launcher.
Initial production rifles were fitted with walnut furniture, consisting of the pistol grip, forward handguard, carrying handle and butt. The wood was treated with oil to protect against moisture, but not varnished or polished. Later production weapons were produced with synthetic furniture. The material used was Maranyl, a nylon 6-6 and fiberglass composite. The Maranyl parts have a "pebbled" anti-slip texture along with a butt has a separate butt-pad, available in four lengths to allow the rifle to be fitted to individual users. There was also a special short butt designed for use with Arctic clothing or body armour, which incorporated fixing points for an Arctic chest sling system. After the introduction of the Maranyl furniture, as extra supplies became available it was retrofitted to older rifles as they underwent scheduled maintenance. However, this resulted in a mixture of wooden and Maranyl furniture within units and often on the same rifle. Wooden furniture was still in use in some Territorial Army units and in limited numbers with the RAF until at least 1989.
The SLR selector has two settings (rather than the three that most metric FALs have), safety and semi-automatic, which are marked S (safe) and R (repetition.) The magazine from the 7.62 mm L4 light machine gun will fit the SLR; however, the L4 magazine was designed for gravity assisted downwards feeding, and can be unreliable with the upwards feeding system of the SLR. Commonwealth magazines were produced with a lug brazed onto the front to engage the recess in the receiver, in place of a smaller pressed dimple on the metric FAL magazine. As a consequence of this, metric FAL magazines can be used with the Commonwealth SLR, but SLR magazines will not fit the metric FAL.
Despite the British, Australian and Canadian versions of the FAL being manufactured using machine tools which utilised the Imperial measurement system, they are all of the same basic dimensions. Parts incompatibilities between the original FAL and the L1A1 are due to pattern differences, not due to the different dimensions. Confusions over the differences has given rise to the terminology of "metric" and "inch" FAL rifles, which originated as a reference to the machine tools which produced them. Despite this, virtually all FAL rifles are of the same basic dimensions, true to the original Belgian FN FAL. In the US, the term "metric FAL" refers to guns of the Belgian FAL pattern, whereas "inch FAL" refers to ones produced to the Commonwealth L1A1/C1 pattern.
SLRs could be modified at unit level to take two addition
L1A1 Self-Loading Rifle