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Since the first time I read about them in Mel Tappan’s book “Survival Guns” I have been interested in the idea of “chamber inserts” and “sub-caliber devices” for survival purposes. These are cartridge-sized adapters which allow shooters to use other types of ammo (generally pistol rounds of the same bore size or smaller) in their guns safely as long as the bore diameters/pressures, etc. are suitable enough to be tolerated. On this episode we discuss the potential applications for such accessories, look at some of the caliber pairings that seem to work best, and consider other factors to keep in mind. At the end we also do a quick overview of the different classifications of NFA firearms and their potential usefulness in a Preparedness context.
Below are some links to products of this type:
http://www3.telus.net/gamegetter/
http://www.mcace.com/adapters.htm
http://www.sportsmansguide.com/net/cb/cb.aspx?a=489745
http://www.gunpartscorp.com/catalog/Search.aspx?filter=chamber+inserts
http://store.dinaarms.com/product_p/12ga22lr.htm
Here are links to .22 uppers available for ARs, Glocks, Berettas, 1911, etc.:
http://cmmginc.secure-mall.com/category/Dedicated-22LR-Uppers-184
http://combatrifle.net/22conversions.htm (drop-in bolt carrier in .22 LR)
http://glockstore.com/pgroup_descrip/20_Training+Devices/2560_.22+LR+Conversion+Kit/
http://www.22lrconversions.com/ber-pg.htm
http://www.marvelprecision.com/
And to the “bump-fire” stock mentioned during the NFA overview:
http://militarygunsupply.com/index.php?main_page=product_info&products_id=1082
In addition, here are a couple of Youtube videos to provide a little more in-depth understanding of how these things work:
