This might sound like I'm reaching and I may be slightly under-informed but here goes.
1. dual-port single shot
2. intergral scope rail
3. intergral recoil lug
4. extended tenon
5. 3 lug bolt with M16 style extractor and one piece bolt handle
1. dual-port single shot
2. intergral scope rail
3. intergral recoil lug
4. extended tenon
5. 3 lug bolt with M16 style extractor and one piece bolt handle