The USMC decided to replace the Winchester model 70/Unertl combination in late 1965 due to the recent changes to the M70 from the pre 64 version and for a lighter rifle scope combo that made quick first round hits easier. The MTU was tasked with coming up with a rifle suitable for the Corps needs for the new sniper program. The MTU conducted tests comparing COTS rifles and scopes currently on the market in December 1965 and January 1966. The testing concluded that the Remington 700- 40x target rifle and the Redfield accu-range 3x-9x rifle scope the best choice for standard sniping issue at the time.
The urgency for the testing resulted in only COTS rifles and optics to be tested by the MTU. Due to the pressure for a fast decision, the MTU worked with the following self imposed assumptions.
The cartridge used would be the the 7.62 NATO.
Most shots would be made at 600 yards or closer.
The scope would be adjustable to 1000 yards
The rifle/scope should be capable of 2 MOA
The combo should be simple and robust and easily trainable.
After the MTU finished the report they recommended that the rifle used be the remington m700-40x. The stock have a dull oil finish. Swivels be military type non removable. The rifle finish to be dull non=glare. The rifle barrel should be 1/10 inch twist, free floating and the action be clip slotted. The USMC wanted a 308 caliber rifle with a medium heavy barrel in a sporter stock and remington company made every effort to give them exactly that,
On April 7th 1966 the remington M700 with redfield scope was adopted for sniping use in south east asia. The USMC stated that nothing about the rifle was unique, just the right combination of parts.
The rifle was planned to be in service by June of 1966. the rifle had a expected service life of 10 years and was to manufactured entirely by remington which would furnish all support equipment for the rifle including optics, carry case and ammo.
The amount of M40 rifles produced by remington for the USMC by year is as follows:
1971/ 1 rifle
By 1973 according to official documents, there was only 425 total density of M40 rifles still in service by the USMC.
The M40 was issued to be used with the Lake City M118 special ball match ammo. the USMC was the fist to use specialized match ammo dedicated for sniper use and the US Army followed.
The rifle was well liked upon first issue by personnel in the sniping and marksmanship community. Reports of the rifle easily shooting 2 MOA from bags with match ammo were normal. Some problems with the redfield scope had already started to surface however, with complaints that it was not easy to adjust for range, would loose focus if turned to 9x and the range finder in the scope would melt if the sun was directly on the objective. The rifle can be uncomfortable during recoil with its light weight and metal butt plate. Marine sniper school students often used rubber shower shoes under their Tshirts during practice to damped the recoil and cut down on the pain.
The rifle was sent to Vietnam and was issued to scout snipers who loved it early on. A number of famous snipers used the M40 to great affect. Chuck Mawhinney made his record 109 kills using the M40 for most of his time and Carlos Hathcock using a M40 for his 2nd tour.
After being issued and seeing service, the problems with the rifle/scope started to show. The rifle, nor the optic were meant for the tropical climate of asia or combat use but did preform well over all. The problems normal for the rifle was the stock warping and putting pressure on the barrel, rust, the scope fogging and the ranging scale melting in the sun. To help the situation Marine RTE armorers were assigned to take care of the rifles and optics while the sniper were responsible for standard PM. The rifle were soon found that they needed to be glass bedded often. The barrel channel had to be constantly check and rasped to keep the barrel free floated and the stock water proofed. The trigger needed to be checked along with the action. Lube was needed often as it was with everything in asia and special “hot lockers” were made by the RTE personnel to dry out the scopes over night after operations to make sure they did not fog up when needed.
RTE personnel soon traveled to keep a check on the rifles and help keep them working. It was found not all losses were combat related. Sometimes a rifle could be out of action just from a ride in a truck. Most being out of action due to scope failure. Most scopes would be out of focus over 8x so the snipers learned to focus only as high as 7x or 8x. Another problem was the optics would sometimes freeze in place if left at one power setting too long. Eventually the snipers learned to watch the optics and glass bedding was authorized for the M40. The stock would warp so badly with the un bedded actions that armorers would take the gun apart and find the action screws tightened so tight that they would not be making contact to the stock from warping and shrinking in the heat. Once glass bedding was OK to do the barrel was floated with 1/8 inch space between barrel and stock and waterproofed. Much of the problems were controlled with careful PM and use.
After most of the problems were understood the general attitude for the M40 was that accuracy was fine and the gun worked as meant and did well. Most liked it fine and felt the gun was almost the equal of the M70 used by earlier Marines. Few had the time and experience to have used both for sniping during the course of the war but Carlos Hathcock who did have the chance thought the M70 better at the time but liked one as well as the other.
After the war the M40 was retained as sniper standard for the USMC and upgrades were made to the original rifle. Improvements included at SS match barrel, a Mcmillian fiberglass stock with a woodland camo patter and a 10x Unertl scope to name a few. The rifle was renamed the M40a1 and has remained in service now in the M40A5 form.
The gun used in the pictures in the remington 2006 scout sniper association re issue. A limited number were made to the same specs as the original. The gun came with a letter ot authenticity from Iron Brigade Armory who helped make sure it was correct. IBA has long been THE source for USMC sniper history. The rifle came correct with the oil finished walnut stock, metal butt plate, barrel parkerized with matching receiver finish. The action is the remington 40x action that has been clipped slotted for stripper clips and has the left side drilled and tapped for rear peep sights. The serial number begins with the SSA ( scout sniper association ) prefix and has the correct U.S. stamped above it.
Standing in for the original redfield accur-range USMC contract scope is a modern redfeild painted green to resemble the original which is very hard to find. The original M40 came with the original redfield JR bases and rings along with the scope. Badger arms made a limited run of these bases and rings for the M40 limited re issue and Leupold has a small run of green finished 3x-9x scopes for the same rifle. Neither was completely correct in make or type but was close enough for most wanting a clone or the original and a considerable amount cheaper.
Above is a picture of the original SHOT SHOW remington flyer for the M40 signed by 3 famous Vietnam USMC snipers and members of the SSA, one being the president at the time, for the author. To the left is the gold scout sniper challenge coin that came with the rifle depicting a USMC sniper in the setting position with a winchester M70/Unertl.
The remington M40 re issue is a nice rifle and a piece of history. They made a very small run but if you are interested in sniping history or the history of the M40 in USMC service it is worth your time to track one down. In 2006 the rifle was around 1100 dollars but would be higher today as everything is. But its a fast way to get started on a sniper rifle collection.