Notes: This is conversion of the old Enfield No. 1, No. 4, No.5, or Indian Enfield rifles into a .45 ACP-firing carbine. The conversion consists of a new barrel, magazine adapter to take a removable M-1911-type magazine, and appropriate modifications to the receiver and action. This is not as easy as it sounds, because the receiver and barrel threads are practically cold-welded together by this point in time. Rhineland modifies the rifles themselves, and also sells kits so that a customer may do the modification on his own. The magazine, when adapted, will take eight rounds, but Rhineland recommends not loading more than seven rounds for reliability. The bolt must be opened smartly between shots, or the spent casing will fall back into the action.

Twilight 2000 Notes: This carbine does not exist.

Notes: This is a well-made and popular hunting rifle found all over North America and Europe. It was introduced in 1984, and is sort of a smaller cousin to the centerfire M-77 rifle. At the time of its introduction, the 77/22 was available with a folding rear adjustable leaf sight and a front sight protected with a tunnel (the model 77/22RS) and with no iron sights, but drilled and tapped for a scope (the model 77/22R). Later, a third type, the model 77/22S, used an open front sight bead. (All these are identical for game purposes.) The barrel is 22 inches long, and the metalwork is blued. In 1989, weatherproof versions appeared, with stainless steel metalwork and black Zytel stocks; these are the K-77/22R without sights, and the K-77/22RS with sights. This rifle has a similar accessory story to the 10/22 Carbine, and is also sometimes used with a silencer.

In 1990, Ruger brought out a magnum version of the 77/22; this is basically identical to the standard 77/22, except for changes to the magazine and changes to the sights necessary for the different cartridge, and is called the 77/22RM. A weatherproof version of this rifle also exists, with stainless steel metalwork and a Zytel stock, the K-77/22RMP.

In 1991 a version of the 77/22 without iron sights (but drilled and tapped for a scope), and with a Zytel stock was introduced (the 77/22RP). Another version, the 77/22RSP, is the same but does have iron sights, and also has mounting rings for a scope. Stainless steel weatherproof versions were also introduced at the same time. These models are identical to the K-77/22R for game purposes.

In 1992, two new versions in .22 Winchester Magnum Rimfire were introduced, they come in blued steel with a walnut stock with sights and drilled and tapped for a scope (the 77/22RSM) and the same weapon in stainless steel with a Zytel stock (the K-77/22RSMP); these are identical to the 77/22RM and K-77/22RMP, respectively, for game purposes. The K-77RMZ is also similar to the K-77/22RMP, but has no iron sights and has mounting rings for a telescopic sight (identical to the K-77/22RMP for game purposes). At the same time, "Varmint" versions appeared (K-77/22VBZ and K-77/22VMB, for .22 Long Rifle and .22 Winchester Magnum Rimfire respectively). This version has stainless steel metalwork, a Zytel stock, and a heavy barrel. The barrel length of these versions were increased to 24 inches in 1998.

In 1995, version of this rifle was introduced firing a light centerfire cartridge, the .22 Hornet. There were three version of this rifle, the 77/22RH, with blued metalwork and a beech stock, no iron sights, and drilled and tapped; the 77/22RSH, with blued metalwork, a rear adjustable leaf sight, and a front sight bead tunnel; and the K-77/22VH, with stainless steel metalwork (with a dull gray finish), a laminated wood stock, no sights, and drilled and tapped. All these rifles are identical for game purposes. As with the "Varmint" models, the K-77/22VH version has its barrel length increased to 24 inches in 1998.

The next new version of the 77/22 came out in 2002. This was another animal, a varmint rifle, plain and simple – firing the .17 Hornady Rimfire Magnum, it is not that effective against much larger targets. Its official company designation is the K-77/17RM. Like many varmint rifles, it has a heavy barrel (24 inches), although what sort of improvement this brings to the accuracy of a small round like the .17 Hornady Magnum Rimfire is questionable. The rifle is not only drilled and tapped for a scope, it comes with Ruger’s integral scope-ring system. The rifle also functions well with a suppressor for game culling.

In 2005, a .17 Mach 2 Rimfire chambering was added to the roundup. This version has a 20" heavy barrel, a laminated stock in target grey walnut or brown walnut, and is drilled and tapped for a scope (and comes with Ruger’s integral scope-ring system). The metalwork is finished in matte stainless steel. The official company designation is K-77/17RM2

Twilight 2000 Notes: The longer barrel length versions of the K-77/22VBZ, K-77/22VMB, and K-77VH do not exist in the Twilight 2000 timeline, nor does the K-77/17RM or the K-77/17RM2. The 77/22RSH and K-77/22VH are quite rare.

Notes: This version of the Ruger 77/22 rimfire rifle is designed to fire .44 Magnum rounds. (It is not capable of chambering .44 Special rounds.) Though the barrel is much shorter than the 77/22, it provides acceptable performance for the .44 Magnum round. The changes in the 77/22 to fire the .44 Magnum round were kept to a minimum; this is partially because the standard 77/22 is such a robust rifle that no significant changes were required in materials for the new cartridge. It is a lightweight weapon that provides excellent stopping power. The standard model is the 77/44R; this version has a walnut stock and blued metalwork, and was introduced in 1997. In 1999, an all-weather version similar was brought out, the K-77/44RSP. This version has stainless steel metalwork and a black Zytel stock. It is about 6 1/2 millimeters longer than the 77/44R, but has the same weight and barrel length (18.5 inches). Both versions have an open leaf rear sight and a bead front sight within a tunnel. They are not drilled or tapped for a scope.

Twilight 2000 Notes: This rifle does not exist in the Twilight 2000 timeline.

Notes: A modification of the Ruger M-77 Mark II, the Frontier is a short-action bolt carbine designed primarily for varminting, though some police forces (particularly in rural areas) have found the Frontier to useful as a patrol carbine or scout rifle. The stock is a beautiful black-and-silver laminated wooden one. The scope mount is ahead of the action in the scout pattern, and the butt has a rubber recoil pad. There are no iron sights. It is an inexpensive but useful alternative to a full-sized tactical sharpshooting rifle.

Twilight 2000 Notes: This rifle does not exist in the Twilight 2000 timeline.

Notes: This is a heavy bolt-action American-made hunting rifle. The Model 77 is not as well known as many other rifles but nevertheless it is still a solid piece of work. It was introduced in 1968, and built until 1989, but sold until 1990. It was initially available in 6mm, .22-550, .220, .243, and .250 Savage, but more calibers were introduced over the years. The .280 version was not available until 1978, and the .257 Roberts and 7mm-08 versions were not available until 1989. The .250 Savage version was removed in 1979, replaced by the 7.62mm NATO model; .358 Winchester and .458 Winchester models were taken out of production in 1989, as was the 6mm version. The .458 Lott version is a special model designed specifically to fire the .458 Lott cartridge; it is available only in one barrel length (23 inches). The Mk I has no drilling and tapping for a scope as standard, but is equipped with iron sights.

Notes: This new version of the Ruger M-77 was originally introduced in 1989 only in 5.56mm NATO caliber and 20-inch barrel. More calibers and barrel lengths were quickly added; in addition, several variant models were introduced over the years. The M-77 Mk II has several important safety modifications over the Mk I; a three-winged safety catch was introduced at the back of the bolt, which locks the bolt and trigger in the rear position when placed in one place, locks the trigger in the central position when placed in another, and finally places the weapon ready to fire when placed in the third. Other modifications include a greatly-improved trigger mechanism, a modified Mauser-type extractor, an improved ejector, and an improved catch for the magazine’s bottom plate. Drilling and tapping for a scope are standard on all models (though not all have iron sights, and many are sold with Ruger-designed scope rings or bases).

In 1990, several new models of the Mk II were introduced: the Mk II R, with a longer 22-inch barrel, more chamberings, and no iron sights; the Mk II RS with less chamberings (.243 Winchester and 7.62mm NATO only), but equipped with an adjustable rear leaf sight (and otherwise identical to the Mk II R); the Mk II RP, with a stainless steel barrel, Zytel plastic stock, and no iron sights; the Mk II RL Ultra Light with a short 20-inch barrel and a wood stock (identical to the standard Mk II in game terms, but the .204 Ruger chambering comes only in a 20" barrel version); and the Mk II RLS Ultra Light Carbine, with a very short 18.5-inch barrel and also with a stock of lighter wood.

1991 brought a left-handed model of the standard M-77 Mk II, but only for .270 Winchester, 7mm Remington Magnum, .300 Winchester Magnum, and .30-06 Springfield calibers. In 1992, eight new calibers were added to the standard Mk II. In 1993, the Mk II RSP was introduced, with a stainless steel barrel, Zytel stock, and open iron sights. The Mk II RSI is a model which has a full-barrel length walnut stock, but only an 18-inch barrel. The Mk II VT (Varmint Target) has a stainless steel receiver and a heavy 26-inch stainless steel barrel, and no iron sights. (The .22 PPC and 6mm PPC chambering for this rifle were dropped in 1997.)

The Mk II RBZ Sporter appeared in 1998; it has a 22-inch barrel except when chambered in magnum calibers, in which case a 24-inch barrel is used. It has a laminated hardwood stock and no iron sights. There is also a version of the Mk II RBZ Sporter with a stainless steel barrel and receiver and open iron sights; this model is identical to the standard Mk II RBZ Sporter for game purposes. There is also a left-handed version of the stainless steel RBZ Sporter (the LRBBZ Sporter), but it is chambered only for .270 Winchester, 7mm Remington Magnum, and .30-06 Springfield. In 1999, the Mk II RLP All-Weather Ultra Light was introduced; this has a plastic stock, 20-inch barrel, and stainless steel barrel and receiver. A left-handed version of this rifle also exists.

In 2001, two compact versions of the Mk II were introduced, with shorter barrels and stocks. The Mk II CR (Compact Rifle) has a walnut stock, blued metal parts, and a very short 16.5-inch barrel. The Mk II CRBBZ has stainless steel metal parts and a black, laminated hardwood stock, but is otherwise identical. 2002 was when the 7mm-08 chambering was added to the two compact Mk IIs.

In 2002, several new chamberings were added to M-77 Mk II R and RP; these were the new Short Magnum cartridges. In 2005, the new chambering of .204 Ruger was added to the standard M-77 Mk II line; unlike most M-77 Mk IIs, this weapon is available in three barrel lengths. In addition, in 2005, a .350 Remington Magnum chambering was added to the M-77 Mk II R; though it was added by popular demand, Ruger has thus far limited the production of this chambering. The .350 Remington Magnum chambering uses a 22-inch heavy barrel, walnut furniture, and has no iron sights.

Twilight 2000 Notes: The following versions of the M-77 Mk II are not available in the Twilight 2000 timeline: M-77 Mk II RBZ, M-77 Mk II RLP, M-77 Mk II CR, and any version chambered in .204 Ruger, any of the Short-Action UltraMag cartridges, any .300 Winchester Short Magnum model, or the M-77 Mk II R in .350 Remington Magnum.