LP 3–12×50 modified by Premier Reticles. Starting in 2007, this model replaced the Unertl MST-100 10× fixed day scope. This dayscope is mounted with Badger Ordnance USMC M40A3 34mm scope rings, which use a standard ring in the rear and a wider MAX-50 ring in front. The standard front ring cap is replaced with a SPA-Defense B634 34mm Male Dovetail, as a mounting platform for the Simrad KN200 Night Vision Weapon Sight. The scope and rings are mounted on a DD Ross 30-minute-of-angle lugged Picatinny rail. M40A5 The M40A5 superseded the M40A3 in 2009, though the evolution between the two systems occurred gradually over a longer period. The primary difference between the M40A5 and the M40A3 is the barrel: The A3's target crown has been replaced with a threaded muzzle and straight tapered barrel to allow the installation of a Surefire muzzle brake and sound suppressor. All M40A5s are fitted with a Badger Ordnance detachable magazine system and a forward rail mount for the AN/PVS-22 night vision optic. Comparison M40A6/A7 On 25 July 2013, the Marine Corps released a solicitation for the M40 Modular Stock Program. Upgraded features are to include a folding stock, compatible with current M40 actions and barrels, to make the rifle more compact for transportation inside confined spaces like vehicles and a full-length rail to accommodate optics and accessories; the M40A5 has only a few inches of rail space beyond the scope for a night vision optic, so extending the rail length would allow more accessories to be attached, enabling snipers to put rounds on target under any conditions. Deliveries were to begin three months after the contract being awarded, with 1,100 stocks to be purchased to upgrade the entire M40A5 inventory. The resulting weapon from the program was originally to be re-designated the M40A6. Remington was awarded the contract in November 2014. The final product will be designated the M40A7 and was planned to be fielded by 2017. The M40A6 began fielding with Marine Corps in June 2016. Differences between M40 and M24 The U.S. Army also used the Remington 700/40x action as the basis for its M24 Sniper Weapon System. The primary difference between the Army and the U.S. Marine Corps rifles is that while the U.S. Marine Corps M40 variants use the short-action version of the Remington 700/40x which is designed for cartridges having an overall length of or less (such as the