Ruger Mini-14 GB. The GB (Government Bayonet) Model of the Ruger Mini-14 was produced for Law Enforcement and Government Use Only #91494. My understanding is that this GB came out of the Minnesota Prison System. It has the inventory number 7H inscribed on the receiver and on the bottom of the trigger group. It is stainless steel with a wood stock. The pictures show an extended magazine release but I have the original one that was on this rifle and it will go with it. It comes with the bayonet in the picture which is a model M7 Vietnam era bayonet. It has the correct black sling, the wood stock is in above average condition, considering that it came out of the prison system, showing only minor handling marks. The GB's are difficult to find today. I have been buying and selling Ruger mini-14's for many years and this is the first GB model I have had the privilege to buy. It's will be a great addition to your collection. It may be a long time before you have an opportunity to purchase another one especially one in this condition.
Here are some internet data on the GB:
Caliber: 5.56x45mm NATO (.223 Remington); also 7,62×39 M43 in Mini-30
Action: Gas operated, rotating bolt
Overall length: 943 mm (851 / 603 mm for AC-556F)
Barrel length: 470 mm (330mm for AC-556F)
Weight: 2,9 kg empty
Magazine capacity: 5, 10, 20 or 30 rounds detachable box magazines
Rate of fire: 750 rounds per minute (for AC-556 only)
Bill Ruger, one of the leading US arms designers of the post-WW2 period, began the development of a new semi-automatic rifle circa 1970. The rifle was intended for either civilian and para-military use; it was patterned after the current US issue military rifle, the M14, and was chambered for relatively new 5,56x45mm (.223 Remington) ammunition. Since its commercial introduction in 1973, the Ruger Mini-14 rifle found wide acceptance among both civilian shooters and a variety of police and security forces around the world. For government users, Ruger produced two specialized versions of the basic rifle- the Mini-14GB and AC-556. The former is still a semi-automatic only weapon but is fitted with protected front sight, flash hider, and a bayonet lug. The latter is a selective-fired weapon and thus can be classified as a true assault rifle. All weapons in the Mini-14 family share the same basic design, although there are differences in certain parts; for example, AC-556 rifles had a slightly longer receiver, which hosts the fire mode switch at its rear part.
The first major modification to the Mini-14 family appeared in 1978 when Ruger introduced an all-stainless version of the basic rifle. Until now, all Ruger Mini-14 rifles are available either in carbon or stainless steel versions. In around 1982 Ruger introduced its next civilian modification of the Mini-14, known as the "Ranch" rifle. This version was optimized for use with telescope sight and thus was produced with integral scope bases on the receiver. The ejection mechanism was changed to eject spent cases to the right side, clear of the scope, and the rear sight was fitted on the folding base. In 1986, Ruger introduced a Mini-30 rifle, which was the same basic weapon but adapted to 7,62x39M43 ammunition of Russian origin. The last change in the Mini-14 line-up appeared as late as in 2005 when Ruger company introduced a new version of the mini-14, which incorporated integral scope bases of the earlier"Ranch" rifles with protected front sight and non-folding diopter rear sight, which has smaller mount that of previous rifles.
In general, Mini-14 rifles are known for their good reliability and durability. Accuracy is usually quoted as somewhat inferior to AR-15(M16)-type weapons, which are very popular in the USA; however, Mini-14 rifles are accurate enough for most purposes and are excellent weapons for hunting, home defense, and general plinking.
Ruger Mini-14 is gas-operated, semi-automatic only weapon which uses Garand-type rotary bolt with two lugs. Action is operated by the long-stroke gas piston, which is located below the barrel and is concealed within the forend of the stock. The gas piston has a cup-shaped head and is linked to the bolt via the Garand-type operating rod which runs at the right side of the weapon. The manual safety is also patterned after M1 Garand or M14 rifle and is located at the front of the trigger guard. The selective-fire AC-556 host's fire mode selection mechanism at the rear of the somewhat lengthened receiver. The fire mode selector is a separate switch on the right side of the receiver, behind the ejection port. It has three positions – for single shots, 3-round bursts, and full-automatic fire.
The standard shield stock of the Mini-14 is of single-piece type, with semi-pistol grip and separate heat shield above the barrel. Early Mini-14 rifles had wooden heat shield which exposed operating rod; military-type Mini-14GB and AC-556 rifles, as well as current production civilian guns, feature polymer heatshields which over most of the operating rod. Over time, Ruger also produced a folding-stock version with a wooden stock, plastic pistol grip and side-folding metallic shoulder stock. Ruger also makes "all-weather" polymer stocks for Mini-14 and Mini-30 rifles. It also must be noted that there are many aftermarket stocks for Mini-14 rifles.
Standard sights consist of a blade-type front and adjustable diopter-type rear sight; "Ranch" type rifles also had integral scope mounts on the receiver, which will accept proprietary Ruger scope rings.
Original magazine capacities for Mini-14 rifles were 10 or 20 rounds, but since infamous American "Assault weapons ban" of 1994 Ruger offered civilian Mini-14 rifles with magazines containing only 5 rounds; however, some magazine makers produced aftermarket magazines for Mini-14 and Mini-30 in capacities of up to 40 (box) and 90 (snail-drum) rounds.