Firing a long arm with the stock folded or removed improves Bulk by 1, but deprives you of the stability that resting it against the shoulder provides. Apply -1 to Acc and +1 to Rcl (unless Rcl is 1), and multiply ST by 1.2, rounding up. Using any sling or a shoulder rig (p. 73) on a stockless long arm can alleviate this. The sling is worn so tight that it pulls the weapon toward the shooter, while he pushes it away. This avoids the Rcl and ST modifications, but not the Acc penalty. It does not count as braced. Shooting a long arm while lying on your back has the same disadvantages as firing without a stock, as the weapon can’t be properly rested against the shoulder unless you shoot straight into the sky.