This blog is dedicated to the proficient defensive use of MGRS maps, the GridScout™ Google-Maps client, and other tools well suited to the goals of GridScout™.
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The ultimate purpose of the GridScout™ map-search tool is to provide for a better community defense. For that same purpose, I’m building a new firearm. I call it the RC1. Why RC1? Because it’s easier to explain that RC1 stands for Reeder Carbine #1 than to explain that PK6 (my original name for the RC1 concept) stands for Piŝta Karabeno je 6,5 Grendel.
My intent is to create a weapon that is easy to operate in close quarters, very well suited for up to 300 yards, and still practical up to 500 yards. While many PDWs are especially good at close quarters and a typical modern carbine is pretty good up to 300 yards, it seems to me that both are severely handicapped beyond that range by their low bullet energy and high aerodynamic drag.
I think I can more fully achieve my chosen goals by creating a custom carbine than by selecting any of the off-the-shelf offerings that I’ve already considered. So I’m going for it, and upon completion we’ll see how it does.
The RC1 will be based largely on the Alexander 6.5 Grendel Incursion, which is relatively light and fires the most effective general-purpose cartridge yet devised for AR15-format firearms. Thanks to the versatility and popularity of Eugene Stoner’s modular design —the Armalite AR-15 upon which the Grendel Incursion and many other modern weapons are based—, we now have a standardized means of interchanging parts to fit the needs of the shooter. The RC1 will take advantage of this in two important ways.
The bolt will be cycled by a gas piston, based on the Armalite AR-180 design, which has proven substantially more reliable than direct gas impingement.
Other part selections, inspired by PDWs and by ultralight carbines derived from the Colt AR15A3, will serve to make the RC1 lighter, more comfortable, and more maneuverable.
The barrel of the RC1 will be just long enough to avoid the red tape associated with a short-barreled rifle. This length also serves to keep the muzzle velocity and bullet energy high enough for practical medium-range use. If I put a muzzle brake on the barrel, it’ll be a short, single-chamber model to minimize the added weight and length.
The RC1 will have a very short, fixed-length buttstock. This would make it uncomfortable with the standard 33° grip angle, so its pistol grip will instead be nearly vertical, as is common in a PDW. This will place the wrist of the shooter’s dominant hand in a neutral position, while the short length of pull will put the entire mass of the RC1 closer to the shooter’s body where it is more easily supported. This gun will be as lightweight as practical, in order to further limit muscle fatigue, as even minor fatigue can affect the steadiness with which the shooter holds his sights on target.
The RC1 will be equipped with two sighting systems:
- A lightweight fixed-power riflescope, sufficient for 500-yard engagements
- Offset iron sights, optimized for quick target acquisition within 50 yards
Progress on this project is as follows. Initially, a few paper parts stand in for some of the actual parts that I have not yet acquired. With a scope and a full magazine, I anticipate a total weight of about 6.8 pounds, and a total length of about 32 inches.
2018-07-05 — Initial concept
2018-07-27 — Weaver K6 scope (paper model)
2018-07-31 — Incognito Arms buttstock
2018-08-02 — Ergo Swift Grip (paper model)
When the RC1 is complete, I will assess the performance of this weapon in a future post. I’ll provide a link here to make it easy on you.
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