It would help if you were more specific about the model and type of rifle. True M84s were all single-shot solid-bottom 7.62mm target rifles for the UK and British Commonwealth prone sling-shooting 'Target Rifle', discipline offered in various timber stocks. The M84 'Canberra' is the centre rifle in the front-cover illustration of the Parker-Hale 1985 catalogue attached below.
There were several magazine adaptations for military and LEA use of the design under different designations, primarily the M86 and M87 models.
All such P-H rifles whether sporters, target models or police / military rifles were basically improved Mauser '98s with an improved trigger assembly and side mounted safety dispensing with the classic Mauser bolt shroud and swing-over safety lever. Early P-H sporters and the 1200TX target model used refurbished and upgraded ex military actions from the huge stocks of surplus military Mausers floating around the 1960s surplus arms markets, but later models used a commercial Spanish made action from the former Spanish government La Corunna factory (also imported into the US under the Santa Barbara name). These retained the basic Mauser receiver and internal magazine form with CRF feed that didn't allow single-loading unless the extractor claw was re profiled.
The M84 retained the Spanish bolt but had a stronger stiffer receiver made by Parker-Hale. Like the 1200TX, they were designed for single-shot use and the extractor was modified for push-feed. However, unlike the 1200TX, the M84 had a flat solid action floor.
A magazine fed 7.62 sniper version of the older 1200TX with an internal 4-round magazine using a substantial but good looking timber stock was developed and adopted by Australia, New Zealand, and Canada, but not the UK itself which rebuilt its WW2 No.4(T) (Lee-Enfield) 303 snipers into a cut-down timber heavy-barrel 7.62. It was designated the P-H M82. They are much sought after today and many former 1200TXs have been rebuilt as M82s by enthusiasts.
In the 1983 Falklands Islands war, the Lee-Enfield rifle (designated L42A1) and so-called RG sniper round performed poorly and the UK MoD sought tenders for new designs. P-H took its M84 Mauser type and comprehensively redesigned it as its contender, designation M85 with yet another new even stronger receiver albeit retaining the Spanish bolt, but with the floor opened for magazine feed. This was a complete redesign of the action and uniquely amongst the series used US M14 magazines. Although initially timber stocked with stained variants of the Canberra match design. most were supplied with heavy impregnated camo pattern McMillan synthetic stocks. These were excellent rifles, but although accepted as a UK service pattern were only bought in small numbers, the main purchase being the radically new Accuracy International PM model adopted as the L96A1, a type the UK forces have remained with ever since in this role as well as their attaining worldwide military and police sales. The remaining P-H M85s were sold off to civilian shooters and are now highly prized and collectible. The design and tooling were subsequently sold alongside other those of other P-H models to a US company on P-H's demise. (Navy Arms?)
The final version of the P-H M84 single-shot model was a contract from the UK MoD for a 7.62mm target version for teenage cadets. the L81A1 and L81A2, a budget and not well made rifle from a company now on its last legs.
The P-H M86 and M87 were 5/10-round detachable box magazine versions of the M84 target rifle for military and police sales with a substantial modified timber stock and reverted to an open-floor action and CRF feed. They sold only modestly, but some survive. A few were specified in 243 Win chambering by some British police forces, but have long since been retired and been replaced by AI rifles. I had one of these some 15 or 20 years ago - good rifle, shot well, but an earlier and poorer generation of models compared to today's chassis-stocked PRS and tactical designs. IIRC they're popular in Canada for rebuilding as a 'fake' service sniper rifle (C3A1?).
I attach pics of this rifle and its action.
There is a great deal of information about these rifles on the US Snipershide Forum and the Canadian Gunnutz (?) equivalent.


