Sling attachment guidance for the Thompson M1 / 1927A-1. Check your exact configuration and both connectors before choosing the McLean Dynamic Retention Sling (DRS). Factory attachment points do not by themselves confirm a direct fit.
Front attachment
Sling swivel on the horizontal foregrip — factory attachment point.
Auto-Ordnance's owner's manual labels a sling swivel on the horizontal foregrip of the TM1 and TM1C, its M1 models. The 1927A-1 page in the same manual shows a vertical foregrip and labels no front swivel. Check which foregrip your carbine has before buying a sling.
Factory attachment point: confirm the connector fits and closes fully on the exact attachment. The existence of a loop does not establish McLean connector clearance.
Rear attachment
Sling swivel on the butt stock — factory attachment point.
The manual labels a sling swivel on the butt stock of both the M1 and the 1927A-1 models. The parts list shows it as a swivel held by two screws. It is a fixed swivel, not a stud or a QD socket.
Factory attachment point: confirm the connector fits and closes fully on the exact attachment. The existence of a loop does not establish McLean connector clearance.
Why this sling on the Thompson M1 / 1927A-1
A PCC is short and light, which makes it easy to carry badly — slung loose it swings into everything. Competition and home-defence use both want it locked flat to the body between stages, then instantly free.
The McLean design is a two-point sling with a patented retention system: it cinches tight to hold the carbine against your body hands-free, then releases into a ready position in one pull. It ships in one size and adjusts, so there is no length to choose.
Fitting it
- Clear the carbine. Unload and clear it following the firearm manufacturer’s instructions before fitting any accessories.
- Front: confirm a compatible connector and follow the sling and attachment manufacturer instructions.
- Rear: confirm the matching connector for your stock or rear attachment; do not assume a slot, stud and QD cup are interchangeable.
- Adjust wearing your kit. A setting dialled in without a vest comes up short once it is on.
- Check the transition. It should shoulder without pulling tight across your chest.
Choosing hardware for your configuration
This page follows the current Auto-Ordnance semi-automatic carbines. The 1942 War Department field manual for the M1928A1 submachine gun likewise places sling swivels on the fore grip and stock. Original military guns and other commercial versions should be checked on their own hardware.
A 1927A-1 with a vertical foregrip has no labelled front swivel in the manual, so a two-point sling needs a front attachment added or a horizontal foregrip with a swivel. Models with a detachable buttstock should be checked with the stock fitted. Measure the swivel opening before choosing a connector.
Questions
Does the McLean Dynamic Retention Sling (DRS) fit the Thompson M1 / 1927A-1?
Compatibility depends on the exact configuration and connectors. Confirm both attachment points and the connector fit before ordering. A factory attachment point does not by itself confirm a direct fit for the McLean sling.
Do I need a snap hook for the front of my Thompson M1 / 1927A-1?
The McLean sling already carries a front hook. Choose a compatible attachment loop or swivel for that hook, and confirm its clearance and closure on your exact setup before buying additional hardware.
What do I need to buy for the Thompson M1 / 1927A-1?
Front: Factory attachment point: confirm the connector fits and closes fully on the exact attachment. The existence of a loop does not establish McLean connector clearance. Rear: Factory attachment point: confirm the connector fits and closes fully on the exact attachment. The existence of a loop does not establish McLean connector clearance.
What length sling do I need for the Thompson M1 / 1927A-1?
There is no length to choose. The sling ships in one size and adjusts, so the same sling covers carry and cinched retention. Set it wearing the kit you actually carry in — a setting dialled in without a vest or heavy coat comes up short once it is on.
Manufacturer and attachment references
Other firearms we have fitment for
Thompson M1 / 1927A-1
Ruger PC Carbine
CZ Scorpion
HK SP5
SIG Sauer MPX
Ruger LC Carbine
Firearm photos: Thompson M1 / 1927A-1 — Auto-Ordnance (Kahr Firearms Group), Manufacturer image used with permission (Cropped to the firearm, removing the banner text; background removed; proportionally resized and centered on a transparent 1536 × 768 canvas.); Ruger PC Carbine — Picanox, CC BY-SA 4.0 (Background removed with segmentation and reviewed manual mask corrections; subject cropped, proportionally resized and centered on a transparent 1536 × 768 canvas.); CZ Scorpion — Costas-1963, CC0 (Background removed with segmentation and reviewed manual mask corrections; subject cropped, proportionally resized and centered on a transparent 1536 × 768 canvas.); HK SP5 — Heckler & Koch, Manufacturer product image (Background removed with segmentation and reviewed manual mask corrections; subject cropped, proportionally resized and centered on a transparent 1536 × 768 canvas.); SIG Sauer MPX — gar2chan, CC BY 2.0 (Background removed with segmentation and reviewed manual mask corrections; subject cropped, proportionally resized and centered on a transparent 1536 × 768 canvas.); Ruger LC Carbine — Sturm, Ruger & Co., Manufacturer image used with permission (Background removed; proportionally resized and centered on a transparent 1536 × 768 canvas.); KelTec SUB2000 — KelTec, Manufacturer image used with permission (Background removed; proportionally resized and centered on a transparent 1536 × 768 canvas.); KRISS Vector — KRISS USA, Manufacturer image used with permission (Background removed; proportionally resized and centered on a transparent 1536 × 768 canvas.).
