I am pretty sure that DPMS carriers are SP1 spec but I don'y own one. do you have a link to the converter you are refering to? If this is one of the conversion units used to convert an AR-15 carrier to M-16 specs then this would be a machine gun part and depending on your local and state laws will affect your use in an AR-15.
As for new open carrier... I doubt this would be a desirable way to go as the carrier takes a lot of slamming and wthin an closed carrier this piece is held in at the rear. With an open style, I would wory about the thing coming loose and it isn't something I would want to risk with my lower.
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