Ready positions
A "ready" is how you carry the mounted or near-mounted rifle when you're not actively firing but may need to — muzzle in a safe direction, finger off the trigger, ready to present to the target in a fraction of a second. The common ones:
Low ready — rifle mounted to the shoulder, muzzle depressed below the target so you can see the target area clearly over the sights. Fast to come up, good default when a threat/target area is in front of you. High ready (muzzle up) — used in tighter spaces or specific contexts; a deliberate choice with trade-offs. Indoor/compressed ready — rifle pulled in tight for moving through confined spaces. Slung/carry — rifle hanging on the sling when you don't need it immediately.
The default to master first is the low ready: it keeps the target visible, the muzzle safe, and presents to a precise shot in well under a second. Whatever ready you use, the safety rules don't relax — muzzle discipline and trigger-finger discipline are constant.
The two-point sling as equipment
A sling is not just a carry strap; a quality two-point adjustable sling is a piece of shooting equipment with two jobs. Retention — it keeps the rifle on your body when your hands are busy (reloading a different way, using a barricade, transitioning, moving), so you never set the rifle down or drop it. And stability — a sling can be cinched or looped to add tension that steadies a position, the carbine analog to a shooting sling on a precision rifle.
An adjustable two-point lets you run the sling slack for free movement and shooting, then quickly cinch it short to lock the rifle tight to your body for retention or to add support in an unsupported standing/kneeling shot. Set it up so the rifle hangs at a natural mounting height when slung, so coming from sling to mount is one smooth motion.
Using the sling to stabilize
For an unsupported standing or kneeling shot with no barricade, sling tension can meaningfully shrink your wobble zone. The principle is the same as the precision-rifle loop sling: create tension between your support arm and the rifle so the rifle is held by the sling's pull rather than purely by muscle. With a modern two-point you can cinch the adjuster down and push out against the sling for a quick, surprising amount of added steadiness — a "hasty sling" you can deploy in a second or two when you have no other support. It won't match a tripod or barricade, but it's always on the rifle and always available.
Tying it together
The carbine fundamentals form a loop: a consistent stance and mount (cf-02) puts the rifle where your eyes are; a confirmed zero and holds (cf-03, cf-04) tell you where to aim from contact distance to 300+; smooth reloads and malfunction clearance (cf-05) keep it running; and ready positions and the sling (this lesson) manage the rifle in the spaces between shots and add stability when nothing else is available. Master this loop and you have a practical rifle you can run accurately and fast across the distances and tempo the carbine is built for. From here, Carbine II takes these into field positions, transitions, and the clock.