It was manufactured in India by Ishapore, and fires the 7.62x52 NATO cartridge. These are not converted rifles, but were actually manufactured as such. The 2A and 2A1 were modeled after the Short Magazine Lee Enfield, No. 3 Mk I rifle (which was licence manufactured in India until 1960). If it's in a shortened "jungle" configuration, this was done by someone after the rifle was manufactured, as Ishapore never manufactured rifles in this configuration.
number5 mark 1 enfield 303 british jungle carbine
Assuming you mean a #5 Enfield Jungle Carbine, value will depend on condition. Can range from $200-$500 dollars
See the link below for a short treatise (with photos) on the various Lee Enfield oilers.
I just purchased one for $400.00 at a pawn shop. <><><> Depending on the condition, above may be a very good price. A note of caution- there are many of the No4 rifles that have been converted to modern fake No5 Jungle carbines on the market today. If you are not CERTAIN about identifying a REAL Jungle Carbine, be sure you are dealing with a reputable dealer.
Do a search for: British No.1 MkIII, No.4 Mk1, No. 5 Jungle carbine or British Enfield these are the three major models of the .303 British rifles.
179 USD
$500
Gun shows, dealers, on line auctions such as auctionarms.com, and gunbroker.com, and parts houses, such as gunpartscorp. If you mean the #5 jungle carbine, they have some forestock parts available. http://www.e-gunparts.com/products_new.asp?CatID=5833
What is the value of Enfield rifle No.5-Mark 1 in excellent condition? Please do not write in this area, or the computer sends your question to the "already answered" bin. Caught it by accident. A Mk 4 in excellent condition, or a mk 5 (Jungle Carbine) would be about $250. Many of the so caled Mk 5s are converted Mark 4s. When buying one, either know the gun, or know the dealer.
Carbine does not actually refer to the bullet but rather the barrel of the rifle. It is a shortened, lighter barrel, which is easier to carry in adverse conditions (forest, scrub, jungle, etc.).
Brittish made Lee Enfield rifles went through many changes up to and including the No4. The No4 was made close to the end of WWII. The Brittish battle needs shifted to jungle warfair after WWII. The No4 was not well suited for the jungle. The No4 is not very common but is not very rare either.
Are you sure it is of Australian make? No. 5 Jungle Carbines were only made in the UK. If your receiver says Australia on it, what you have is most likely a Lee Enfield no 1 Mk III Lithgow rifle, and I would be hesitant to fire it if it is indeed in 308 Winchester. The action is not as strong as the later Enfield rifles and the pressure limits of 308 Win are significanly higher than those of the .303 British cartridge. In fact, when India began building their Ishapore 7.62 rifles, they found the No 1 Mk III action completely unsatisfactory, and even had to improve the metallurgy of their No 4 rifles. To answer your question on the scope mount...You need to identify the firearm and assess it's safety first, by bringing it to a competant gunsmith. Afterward, you should google the mount. Many websites offer them for sale.