There were variation in the A2 rifle, the only thing that changed in the actual A2 marked component is the re-enforced area around the buttstock as A1s were breaking when used as a club etc.
The A2 buttstock is a bit longer, the A2 rear sight is not asjustable 300-800 for elevation as the A1 sight was only windage adj. Burst, Auto collapsing stock, short barrel etc etc were all available on the A2 rifle.
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