What it says on the tin

CAR list:

Spoiler!

• Polizei Tactical Handguard (AMCAR)
• Medium Barrel (AMCAR)
• Semi-Retro Handguard (CAR-4)
• Contractor Handguard (CAR-4 and AMR-16)
• Contractor Upper (CAR Rifles)
• Contractor Lower (CAR Rifles)
• Krieg Railed Handguard (AMR-16)
• Celestial Handguard (CAR-4)
• Celestial Upper (CAR Rifles)
• Celestial Lower (CAR Rifles)
• Cynosura Iron Sights (CAR-4 and AMCAR)
• Ursa Major Barrel (CAR-4 and AMR-16)
• Ursa Minor Upper (CAR Rifles)
• Ursa Minor Lower (CAR Rifles)
• Schäfer Lower (Most CAR Rifles)
• Kante Upper (Bootleg)
• Doppelgänger Magazines (Bootleg and other STANAG Mag Guns)
• Extended Handguard (Bootleg)
• Celestial Grip (Bootleg)
• Comfort Grip (AR Grip Guns)
• Aftermarket Sharps Magazine (STANAG Mag Guns)
• Akron Padded Grip (AR Grip Guns)
• Plebeian Rail (CAR-4, AMR-16)
• Signature Rail (CAR-4, Para)
• Overly Tactical Mag (STANAG Mag Guns)
• Simmons Handguard (Contractor .308)
• Nötigstes Stock (Most AR-Style Guns)
• Full 60 Drum (STANAG Mag Guns)
• Celestial Assault Stock (CAR weapons that use the regular lower receiver)
• Restored Internals (AMCAR)
• Edgewise Handguard (AMR-16)
• Ay-Four Handguard (AMR-16)
• Comet Handguard (CAR-4)
• Refurbished Internals (CAR-4)
• Match Magazine (STANAG Mag Guns)
• Modern Milspec Grip (AR Grip Guns)
• Schäfer Tactical Grip (AR Grip Guns)
• Flush Handguard (AMCAR)
• Retro Handguard (AMCAR)
• Quiet Handguard (AMCAR and Para-23)
• Solid Slider Stock (CAR weapons that use the regular lower receiver + Little Friend 7.62)
• Stocked Stock (CAR family weapons)
• Ursa Minor Barrel (AMCAR and CAR-4)
• Celestial Handguard (AMR-16)
• Classic Shorty Handguard (Para-23)
• Dwarf Barrel (North Star)
• Stellar Handguard (Bootleg, Little Friend 7.62)
• Quick Tactical Mag (STANAG Mag Guns)
• Elongated Straight Grip (AR Grip Guns)
• Desert Rail (CAR-4, AMR-16)
• Milspec Magazine (Contractor .308)
• Speed Pull Magazine (Contractor .308)
• Ranger Handguard (Contractor .308)
• Lighter Handguard (Little Friend 7.62)
• Schäfer Polymer Mag (STANAG Mag Guns)
• CAR-40 Mag (STANAG Mag Guns)

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AK list:

Spoiler!

• Vityaz Grip (Most AKs except AK Gen 21)
• Gecko Grip (All AK Grip Guns)
• Gecko Barrel (AK 5.45, AK 7.62(G))
• Hunker Down Barrel (AK 5.45, AK 7.62(G))
• Bottle Popper Handguard (AK Rifles and Izhma 12G)
• Mall Ninja Handguard (AK 5.45, AK 7.62(G), RPK)
• Israeli Sniper Stock (AK 5.45, AK 7.62(G), RPK, Krinkov)
• Israeli CQB Handguard (Krinkov)
• Commando Magazine (AK 5.45 and AK17)
• Seven-Six-Smooth Magazine (AK 7.62(G), Krinkov)
• Shafted Stock (AK 5.45, AK 7.62(G), RPK, Krinkov, Izhma 12G)
• Izhma Smooth Handguard (AK 5.45, AK 7.62(G))
• Israeli CQB Barrel ((Akimbo) Krinkov)
• Folded Stock (AK 5.45, AK 7.62(G), Krinkov, Izhma 12G)
• Squad Stock (AK 5.45, AK 7.62(G), Krinkov, Izhma 12G)
• DMR Kit (AK17)
• Side Bar Bolt (AK17)
• Sawblade Grip (AK Grip Guns)
• The Rifleman's Guide Magwell (AK 5.45, AK 7.62(G)))
• Secure Magwell (Izhma 12G)
• Bullwark handguard (Izhma 12G)
• Conventional Handguard (Izhma 12G)
• Gravel Stock (AK Gen 21)
• Wood Stock (AK Gen 21)
• Wood Handguard (AK Gen 21)
• Tungsten Loads (AK 7.62(G), Krinkov)
• East German Handguard (AK 5.45, AK 7.62(G))
• East German Barrel (AK 5.45, AK 7.62(G))
• East German Compact Barrel (AK 5.45, AK 7.62(G))
• East German Grip (All AK Grip Guns)
• Black Winter Handguard (AK17)
• Black Winter Body (AK17)
• Classic Bakelite Mag (AK17)
• Survivalist Stock (AK 5.45, AK 7.62(G), Krinkov, RPK)
• Topless Handguard (RPK)
• Reaper Magazine (AK Mag Guns)
• Sliding Stock (Gecko 7.62)
• Detached Stock (Gecko 7.62)
• Improved Internals (AK 7.62)
• Slavic Hazard Barrel (RPK)
• Regretless Handguard (AK 5.45, AK 7.62(G))
• German Export Stock (AK Stock guns)
• Goliath Handguard (AK 5.45, AK 7.62(G), IZHMA 12G)
• Lightened Handguard (Krinkov)
• Plastic Handguard (Krinkov)
• Equilibrium Barrel (AK 5.45, AK 7.62(G))
• Waffle Handguard (AK Gen 21)
• Derailed Dust Cover (AK Gen 21)
• Smooth Grip (AK Gen 21, Ketchnov Byk-1)
• Modern West Magazine (AK 5.45 and AK17)
• Modern Handguard (AK 5.45, AK 7.62(G))
• Wood Handguard (IZHMA 12G)
• AK24 Magazine (AK 5.45 and AK17)
• Bakelite Magazine (Ketchnov Byk-1)
• K-B Magazine (Valkyria)
• Thread Cutter Magazine (Valkyria)
• Gecko Stock (Valkyria)
• Comfort Grip (Gecko 7.62)
• Light Long Handguard (Gecko 7.62)
• Plastic Modern Handguard (AK 5.45, AK 7.62(G))
• Modern Grip (AK Grip Guns)
• Solid Folding Stock (AK 5.45, AK 7.62(G), IZHMA 12G, RPK, Krinkov)
• Modern Rifle Barrel (AK 7.62(G))
• Sneaky Barrel (AK17)
• Compact-5 Handguard (AK Gen 21)
• Gripped Mag (Valkyria)

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Attachments for both:

Spoiler!

• Improv Stock
• Sportsman Stock
• Heavy Tactical Stock
• Contractor Compensator
• Desert Suppressor
• Shaved Stock
• Tactical Flash Hider
• Revised Tactical Stock
• Out of Stock Stock