The best rear bag for an AR-platform rifle is a short, light one that stays on the rifle and sits under the stock. Size it to sit under the toe of the stock without crowding your support hand, then check how it attaches to your sling or stock.
What does an AR-platform rifle ask of a rear bag?
Three things. The bag has to be small enough to sit under the toe of the stock without crowding your support hand. It has to stay with the rifle through carries and position changes. And it has to work on the stock you have, which on this platform varies a lot.
AR-platform stocks come in fixed, collapsible and adjustable shapes. The Sport 7" fits AR-platform rifles with a buffer tube. The All-Stock Adapter ($35.95, left or right hand) is nylon webbing with a hook-and-loop strap that wraps the stock and gives the bag a mounting point on any stock, which is the route when a stock has no point of its own.
Where does the Sling Steady Sport 7" fit?
The Sport 7" is a rear shooting rest bag that sits under the stock, made for AR-platform rifles. It measures 7" × 2.5" and weighs 6.3 oz in Black (6.8 oz in the other colors). It ships filled with SteadyFill, and hook-and-loop ports let you add or remove fill. It has a three-layer build with an abrasion-resistant grip fabric on the contact face. It is made in the USA, patented under US 12,339,095, and costs $89.99 in Black, Sand, Digital Camo or Woodland Camo. Sling Steady is a veteran-run company.
In our testing, shots landed 28% closer to the bullseye with Sling Steady under the stock, and muzzle rise was about 75% lower. It also helps manage recoil.
How do you attach a rear bag to an AR-platform rifle?
The bag rides on your sling or attaches directly. It ties into the rear QD point or sling swivel and sits at the toe of the stock. No sling comes with the bag.
Your sling decides the part you buy. A sling with a QD at the bottom lets the bag clip straight onto the sling. A sling with a QD on each side uses the Y-Clip Sling Adapter ($59.95), which connects the bag to the sling you own. The Y-Clip Full Length Sling ($65.95) is made for AR-platform rifles. Our post on which Y-Clip you need goes through the choice.
Which bags cost less than the Sport 7"?
As listed on 4 November 2026 on each maker's page: Short Action Precision's Lightweight Bag is under 5 oz, not including the swivel, at $44.99, with a tether to the butt stock and options for no swivel, a flush cup swivel, a sling swivel or an HK hook. MDT's Traveler lists 8 oz with Spex Lite fill at $69.99, with a lanyard that clips to a QD swivel or loops onto the sling. Crosstac's rear squeeze bag is $29.99 in a 6 inch or 8 inch size, with a wrist strap and a sewn-in D-ring. Crosstac does not publish a weight on the page we read.
Each of these costs less than the Sport 7" at $89.99. Only the Short Action Precision bag is lighter. Neither Short Action Precision nor MDT says whether its weight is filled or empty.
How do you choose?
Start with the stock. If its shape is unusual, ask before you buy. Then pick the attachment that matches your sling, and decide how much weight you want on the rifle.
If the bag has to be on the rifle every time you pick it up, the Sport 7" is built for that. If you want the lowest price or the lowest weight, the bags above are worth a look. Questions on fit go to info@slingsteady.com.
See the Sport 7" for your AR-platform rifle.
Related reading: Pro 9" or Sport 7": choosing the right bag · How to install Sling Steady on your sling · Range day: using a rear squeeze bag on the bench and prone
Sling Steady is Ready When You Are.