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The Model 721 Remington was in production from 1948 to 1962. One of the really nice things about gun companies is when they drop a model...they drop it with a very loud "THUD" As you know the extractor on this model is a circular spring type arrangement, which has been the cause of much grief on several remington models. This part is a hard unit to find. A solution is the aftermarket unit designed by Superior Shooting Systems.. a Remington Rifle "Sako" style extractor kit. This unit will fit the model 721/722 bolt. However it is not a drop-in/snap-in replacement. it does require some reworking of the bolt a machine cut to the bolt. Go to www.brownells.com and check out stock number 840-000-025AA. You can consult the Brownells tech Staff as to which of the 4 different kits is suitable for your chambering in your Model 721. BTW they also offer the cutters needed to perform the job. Hope this is of some help. Zeke
Refer to Brownell's Gunsmith Kinks #4 p.342...new Rem 7400/7600 extractors are similar...by thinning out the 7400/7600 extractoe to fit the recess in the bolt head and adjusting its tension you will have a working rifle...this kink worked for me and a happy customer put his 721/222 back in the field. no modifications just alittle grinding on an inexpensive part...hope this helps