A support member for supporting a mortar shell (1) into a barrel (2) of a weapon, and a method for attaching said supporting member (6) to a tail (4) in the mortar shell (1). The supporting member (6) includes a support element (8) provided with a rim flange (7) and a firing mechanism (15). The support element (8) is supported by means of one or more attachment pieces (10) against a front rim (23) in guiding fins (5) in the mortar shell (1). The attachment pieces (10) include a predetermined deformable point enabling the detachment of the fired mortar shell (1) from the supporting member (6).
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