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This is the difference (the hand guard w/full length rail) (which you would get if you replaced the Defender's hand guard) Paul. The core rifle specifications are identical. (Defender Specifications and Features): - ArmaLite Defender 15 Semi Auto Rifle DEF15 - 5.56mm NATO (accepts .223 Remington) - 16" Double Lapped, Chrome Lined, Chrome Moly Vanadium MIL-B-11595-E Barrel - With M203 Step down - 1:7" Right hand twist - Threaded 1/2x28 - Flash suppressor muzzle device - Gas block with picatinny rail - 7075-T6 Aluminum Flat Top Upper Receiver - 7075-T6 Aluminum Lower Receiver - Single Stage Trigger - Polymer handguards - A2 pistol grip - Collapsible stock - 30 round magazine - Anodized upper and lower receiver - Manganese phosphated steel barrel - Overall Length: 32" Collapsed / 35.25" Extended - Overall Weight: 6.35 lbs - Black. ( (Tactical Light Specifications and Features) ): - Armalite M15 Light Tactical Carbine M15LTC16-AR15 Semi Automatic Rifle-5.56mm NATO (accepts .223 Remingto

yes you are correct the handguard is the major difference other that that they are the same basic rifle

Hi Paul, Yes They're identical except for the handguard. That is the major difference