VH> MS>JS> MS>SG> Yes, I've seen some CB caps, or better yet some
VH> MS>JS> standard-length
VH> MS>JS> MS>SG> Shorts
VH> MS>JS> MS>SG> and LR loaded down to CB levels.
VH> MS>JS>
VH> MS>JS> MS>    Will they function a semiauto pistol action?
VH> MS>JS>
VH> MS>JS> No.  Not without extensive modification that will render the 
VH> gun
VH> MS>JS> useless
VH> MS>JS> for reguar ammo.
VH> 
VH> MS>    What about just interchangable springs?
VH> 
VH> Springs won't do it -- the key to reliable operation of a blow-back
VH> semi-auto is the mass of the breech block or bolt.  You can actually
VH> take the recoil spring OUT, reassemble the gun and fire it with a CB 
VH> cap
VH> and see that it won't extract and eject.
VH> What you have to do is reduce the mass of the bolt.  You can do that 
VH> by
VH> skeletonizing -- but then you can't use the same bolt for regular .22 
VH> LR
    Why doesn't someone sell such a kit, the way .22 LR conversion kits are 
widely-available for a variety of semiauto rifles and the M1911?
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