Defender custom 357,457, 50 caliber stubby barrels These are to be used with the gun alone as pictured. You could use the short or long black plastic extenders that come with the gun
 
Package:
2  Barrels 
100 Discs
12 Rounds Certified Slugs
 
NOTE: To use these, you need the same air cartridge adapter that the 45cal barrels use. So, if you already have a 45cal Defender you have them already, if not we have these for sale on the site. Also, the second picture shows the in use in a Defender 2, the purchase price is for 2 barrels and sample pellets, the AEA Defender 2 is not included.