Measure the full length
Measure from end to end with the stock in the position you use for storage. Include the muzzle device, buttpad and anything else that adds length, rather than estimating from a model name.
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Give a scoped AR-15 or larger rifle a soft, silicone-treated cotton layer for the time it spends in the safe, at the bench or on the way to the range.

A better fit for a larger profile
An AR-15 can change shape quickly. A mounted optic, taller turret, rail accessory, sling, extended stock or muzzle device all affect how the rifle moves in and out of storage. A sleeve that is technically long enough can still be frustrating if it catches on the equipment that makes the rifle yours. The right gun sock starts with room for the complete setup, not a stripped-down measurement.
A Sack-Up gives the rifle a soft boundary during ordinary storage and handling. It can help reduce finish-to-finish contact when firearms share a safe, keep dust and fingerprints from becoming part of the routine and make it easier to return the rifle to its usual position after time at the range. The goal is not to complicate storage. It is to make the next step after cleaning and inspection simple enough to repeat.
Every Sack-Up is made from a true cotton blend treated with silicone. The soft knit construction is intended for clean, dry firearms that are ready to rest between outings. It is a useful layer alongside secure storage, regular inspection and the care guidance from the firearm manufacturer.
Space where AR-style rifles need it
The Model 104 and Model 110 are the roomier Sack-Ups options for scoped rifles and AR-style setups. Their larger profile gives an optic, rail equipment and a broader stock the clearance needed for the sleeve to slide on and off without turning storage into a tug-of-war.
For a compact AR-15 with a simpler profile, a shorter sleeve may be the better place to start. The important thing is not the name on the rifle. It is the complete unloaded firearm in front of you. Measure it as it is stored, including the stock position and every feature that adds length or bulk. Then choose a Sack-Up that goes on smoothly and leaves the rifle easy to handle.
Why cotton works →
Choose by the complete setup
Measure from end to end with the stock in the position you use for storage. Include the muzzle device, buttpad and anything else that adds length, rather than estimating from a model name.
Scopes, red dots, raised mounts, lights, slings and rail accessories change the outline. A roomier sleeve keeps the fabric from binding as it moves over those details.
Choose a size that slips on and off calmly. An easy fit is more likely to stay with the rifle after every range day, storage check and change in the collection.
If the AR-15 carries a larger optic or accessories that change its shape, start with the roomier options. The Sack-Ups Buyer’s Guide gives a practical place to compare the complete rifle with common sleeve sizes.
Use the fit guide →Shop AR-15 gun socks
A calmer spot in the safe
An AR-15 with an optic and sling often takes up more real estate than the space suggested by a safe’s capacity number. The listed number may not account for the clearance needed to lift one rifle out without pulling it across the next, or the room that a taller scope needs above the receiver. A fitted sleeve adds a softer layer, but the storage layout still needs enough space to do its job.
Give larger setups their own clear position. Put the rifles you use most where you can reach them without moving half the row, and leave enough room that a sling or optic is not pressed against a neighboring firearm. This makes the safe easier to inspect and makes it easier to notice when a sleeve is dusty, a storage area is crowded or a rifle needs attention before it goes back in.
Keeping one properly sized Sack-Up with each rifle also reduces the little decisions that make a routine fall apart. After a clean, dry AR-15 is ready for storage, the right sleeve is already there. The rifle can return to the same protected spot without searching for a cover that may or may not fit.
Follow the firearm manufacturer’s instructions and applicable safety practices. Remove obvious dirt and moisture, allow the rifle to dry and complete any manufacturer-recommended care before putting a clean, dry sleeve on it.
Leave clearance around optics, slings and controls. A soft sleeve helps reduce ordinary contact, but a secure storage position and a layout that does not crowd the rifle still matter.
A Sack-Up is a useful soft layer when moving between storage, a vehicle and the range. For travel, follow all applicable requirements and use the required hard case or other equipment.
Protection that stays practical
The best AR-15 storage routine is not the most elaborate one. It is the one that happens after every outing. Start with a clean, dry rifle, use a sleeve that does not strain around the optic or accessories and return it to a secure place where it can be removed without bumping the surrounding gear.
Check the rifle, sleeve and storage space regularly. A quick review helps catch a crowded row, a dusty shelf or a moisture concern before it becomes the kind of problem that is easier to prevent than to undo. If the rifle’s setup changes with a new optic, stock or accessory, recheck the fit instead of forcing the old sleeve to do a new job.
For a collection with several AR-style rifles, a different Sack-Up for each profile can make storage easier to understand at a glance. A compact carbine, a scoped rifle and a larger setup do not need to share one guess at a size. Give each one the room it needs, then let the storage routine stay simple.
Frequently asked questions
Measure the unloaded AR-15 from end to end, including the stock position, muzzle device, optic, sling and any other feature that changes its length or profile. The larger Model 104 and Model 110 Sack-Ups are designed to give scoped and AR-style setups more room than a standard rifle sleeve.
A gun sock should slide over an optic without forcing the fabric. Choose a roomy sleeve, then compare the complete rifle with the Sack-Ups fit guidance before ordering. If the optic, stock or other equipment creates a wider profile, allow extra space for an easy on-and-off fit.
A clean, dry, properly fitted Sack-Up can add a soft layer while an AR-15 rests in a secure safe, cabinet or other appropriate storage space. It does not replace secure storage, routine inspection or the firearm manufacturer’s care guidance.
A Sack-Up is a useful soft layer when moving a rifle between storage, the range and a vehicle. For travel, follow all applicable laws and the requirements of the carrier and destination, including any hard-case or other equipment requirements.
Give your setup the room it needs