If you get the Nordic extended tube get the +2 with the XL end cap ... this will give you 8 in the tube with the nordic spring or factory spring. And will be flush. Add the XXL 1 1/2" will give you +2 ... But will be way past the muzzle.
heres M24Shooter's Spx w/ a XL end cap:
heres M24Shooter's Spx w/ a XL end cap:

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