In the late 1960s, RSAF Enfield entered the commercial market by producing No.4-based 7.62×51mm rifles for sale. The products were marketed under alliterative names e.g. Enfield Envoy, a rifle intended for civilian competition target shooting and Enfield Enforcer, a rifle fitted with a Pecar telescopic sight to suit the requirements of police firearms teams. At some point just after the Sino-Indian War of 1962, the Rifle Factory Ishapore in India began producing a new type of rifle known as the Rifle 7.62 mm 2A, which was based on the SMLE Mk III* and was slightly redesigned to use the 7.62×51mm NATO round. Externally the new rifle is very similar to the classic Mk III*, with the exception of the buttplate (the buttplate from the 1A SLR is fitted) and magazine, which is more "square" than the SMLE magazine, and usually carries twelve rounds instead of ten, although a number of 2A1s have been noted with 10-round magazines. Ishapore 2A and Ishapore 2A1 receivers are made with improved (EN) steel (to handle the increased pressures of the 7.62×51mm round) and the extractor is redesigned to suit the rimless cartridge. From 1965 to 1975 (when production is believed to have been discontinued), the sight ranging graduations were changed from 2000 to 800, and the rifle re-designated Rifle 7.62 mm 2A1. The original rear sight arm was found to be suitable for the ballistics of the 7.62×51mm, which is around 10% more powerful and equates to a flatter trajectory than that of the .303 British MkVII ammunition, so it was a simple matter to think of the '2000' as representing metres rather than yards. It was then decided that the limit of the effective range was a more realistic proposition at 800 m. The Ishapore 2A and 2A1 rifles are often incorrectly described as ".308 conversions". The 2A/2A1 rifles are not conversions of .303 calibre SMLE Mk III* rifles. Rather, they are "newly manufactured firearms" and are not technically chambered for commercial .308 Winchester ammunition. However, many 2A/2A1 owners shoot such ammunition in their rifles with no problems, although some factory loaded .308 Winchester cartridges may appear to generate higher pressures than 7.62×51mm NATO, even though the rounds are otherwise interchangeable – this is due to the different systems of pressure measurement used for NATO and commercial cartridges.