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AR-15 builder

Build a full-size AR-15 from real parts, with fit, caliber and legal checks.

261 real parts with typical prices, fit checks and pros and cons.

Open the AR-15 builder

Barrel

• Criterion Barrels CORE 14.5" .223 Wylde Mid-Length Chrome-Lined Barrel (15140-CR8) $313
• Ballistic Advantage Modern Series 16" 5.56 Government Profile Mid-Length Barrel (BABL556015M) $175
• Ballistic Advantage Premium Series 16" .223 Wylde SPR Fluted Mid-Length Barrel (BABL223017PL) $238
• Faxon Firearms Duty Series 16" Pencil 5.56 NATO Mid-Length Barrel (15A58M16NPQ) $187
• Dirty Bird 16" 5.56 M4 Carbine Phosphate/Chrome-Lined Barrel w/ F-Marked FSB (D264) $230
• Ballistic Advantage Performance Series 13.7" 5.56 Hanson Mid-Length Barrel w/ Low Pro Gas Block (BABL556036F) $163
• Aero Precision 12.5" 5.56 Government Profile CMV Barrel, Carbine Length (APRH100422C) $170
• Ballistic Advantage Modern Series 16" .300 BLK DRP Pistol-Length Barrel (BABL300011M) $171
• Faxon Firearms Duty Series 16" Gunner .300 BLK Carbine-Length Barrel (15A38C16NGQ) $173
• CMMG 12.5" .300 BLK Pistol-Length Multi-Role Barrel (CMMG30D8A0A) $180
• Bravo Company Manufacturing Standard 12.5" Enhanced Fluted .300 Blackout Barrel, Stripped $355
• Faxon Firearms Match Series 16" Gunner 6.5 Grendel Mid-Length Barrel (15BG8M16NGQ-5R-NP3) $249
• Ballistic Advantage Premium Series 16" 6.5 Grendel SPR Fluted Mid-Length Barrel $255
• Wilson Combat 16" 6.5 Grendel Recon Round Barrel, Stainless $337
• Faxon Firearms Duty Series 16" Gunner 7.62x39 Mid-Length Barrel (15A78M16NGQ) $176
• Green Mountain Rifle Barrel 16" 7.62x39 M4 Profile Carbine Barrel, Nitride (GM-M10) $183
• NBS 14.5" 7.62x39 Carbine Medium Barrel, Black Nitride $100
• Faxon Firearms Duty Series 16" Gunner Big Bore .450 Bushmaster Barrel (15A45016C16NGQ) $218
• Bear Creek Arsenal BC-15 16" .450 Bushmaster 416R Stainless Heavy Barrel, Carbine Gas $66
• Satern Barrels 16" .450 Bushmaster Heavy Stainless Barrel, 1:20 $327

Handguard

• Bravo Company Manufacturing MCMR-10 M-LOK Free-Float Handguard $200
• Geissele Automatics MK16 Super Modular Rail 13.5" (URGI) $375
• Geissele Automatics Super Modular Rail MK4 M-LOK 13.5" $325
• Daniel Defense RIS II MK18 9.5" Quad Rail $523
• Daniel Defense MFR XS 15.0 M-LOK Rail $325
• Midwest Industries Combat Rail M-LOK 15" $189
• Bravo Company Manufacturing KMR Alpha 13 KeyMod Free-Float Handguard $225
• Bravo Company Manufacturing QRF-12 Quad Rail Free Float Handguard $225
• Spikes Tactical CRR Free Float Quad Rail 15" $240
• Magpul MOE SL Hand Guard, Mid-Length AR15/M4 (MAG551) $38
• Aero Precision ATLAS S-ONE M-LOK Handguard 12.7" $175
• Faxon Firearms Streamline Carbon Fiber M-LOK Handguard 15" $295
• Battle Arms Development WORKHORSE M-LOK Handguard 13" $137
• Fortis Manufacturing REV II Free Float Rail System 13.8" $180
• Wilson Combat M-LOK Rail 13.8" (TRMLOK14) $200
• Odin Works O2 Lite KMod Forend 12.5" $189
• Expo Arms M-LOK AR-15 Handguard 15" (XP-GUARD15) $90
• UTG PRO (Leapers) PRO M-LOK AR15 13" Super Slim Free Float Handguard (MTU006SSM) $120
• Aero Precision Quantum M-LOK Handguard 12" w/ BAR Barrel Nut $105
• Samson Manufacturing Evolution KeyMod Rail 12.37" (KM-EVO-1237) $172

Muzzle device

• SureFire WARCOMP 5.56 $152
• SureFire SF3P Flash Hider 5.56 $152
• SureFire SF3P 7.62 Flash Hider $153
• Dead Air KeyMo Flash Hider (DA301) $84
• Dead Air KeyMo Muzzle Brake .30 cal (5/8x24) $89
• Precision Armament M4-72 Severe-Duty Compensator 5.56 $85
• Strike Industries King Comp .223/5.56 $46
• KAK Industry Slimline Flash Can (1/2x28) $35
• CMC Triggers A2 Birdcage Flash Hider $15
• SilencerCo ASR Flash Hider 5.56 (AC141) $94
• HUXWRX Flash Hider QD 556 $129
• VG6 Precision Gamma 556 Muzzle Brake $81
• SilencerCo ASR Flash Hider .30 Cal 5/8x24 (AC590) $70
• VG6 Precision Gamma 762 Muzzle Brake $90
• Dirty Bird .30 A2 Birdcage Flash Hider 5/8x24 $16
• VG6 Precision Gamma 65 Muzzle Brake $90
• HUXWRX Flash Hider QD 6.5 5/8x24 $164
• Precision Armament HYPERTAP Muzzle Brake 6.5mm (A04624) $165
• Ruger .450 Bushmaster Precision Hybrid Muzzle Brake (90641) $107
• SilencerCo ASR Muzzle Brake .458 Cal 11/16x24 (AC1961) $80

Upper receiver

• Aero Precision M4E1 Stripped Upper Receiver $135
• Aero Precision AR15 Stripped Upper Receiver $100
• Palmetto State Armory PA-15 Stripped Upper Receiver $70
• BCM M4 Flat Top Upper Assembly $160
• Geissele Automatics Super Duty Upper Receiver $185
• Noveske Gen 4 N4 Upper Receiver $300
• CMT UPUR-2 Billet Upper $158
• San Tan Tactical STT-15L Lite PILLAR Billet Upper $209
• Gibbz Arms G4 Side Charging Upper $250
• Aero Precision AR15 Assembled Upper Receiver (APAR501603AC) $125
• Griffin Armament Mk1 AR15 Upper Receiver, Assembled $110
• Aero Precision M4E1 Threaded Assembled Upper Receiver $160
• Aero Precision M4E1 Stripped Upper Receiver, No Forward Assist $130
• VLTOR MUR-1A Modular Upper Receiver $270
• Forward Controls Design URF-F Forged Upper Receiver $128
• Anderson Manufacturing AM-15 Stripped Upper Receiver (A3) Price varies
• Seekins Precision SP223 Billet Upper Receiver $227
• Stag Arms Stag 15 A3 Left-Handed Stripped Upper $95
• Bear Creek Arsenal Right Side Charging AR-15 Upper Receiver (UR-SC15) $168
• Faxon Firearms Enhanced Forged Stripped Upper Receiver $92

Charging handle

• Mil-spec charging handle $25
• Radian Weapons Raptor Ambidextrous Charging Handle $105
• Radian Weapons Raptor-LT Ambidextrous Charging Handle $80
• Geissele Automatics Airborne Charging Handle $110
• Geissele Automatics Super Charging Handle (SCH) $99
• BCM Gunfighter Charging Handle $80
• Breek Arms Sledgehammer Ambi Charging Handle (Mod2) $70
• SilencerCo Gas Defeating Charging Handle (GDCH) $97
• Aero Precision BREACH Ambidextrous Charging Handle $85
• Griffin Armament SN-ACH 15 Gen 2 Charging Handle $95
• Strike Industries T-Bone Charging Handle (.223/5.56) $38
• Radian Weapons Raptor-SD Ambidextrous Charging Handle $135
• Breek Arms Warhammer Mod2 Ambidextrous Charging Handle $45
• Precision Reflex Gas Buster Charging Handle (Combat Latch) $99
• Daniel Defense GRIP-N-RIP Ambidextrous Charging Handle $117
• Saraid Top Notch Charging Handle $150
• Aero Precision AR15/M4 Standard Charging Handle $22
• Strike Industries ARCH Charging Handle $30
• BCM Gunfighter Ambidextrous Charging Handle Mod 4x4 $90
• Breek Arms Sledgehammer Omni-Buster Ambi Charging Handle $70
• Rainier Arms Avalanche AR-15 Ambidextrous ANC Charging Handle $75

Lower receiver

• Aero Precision M4E1 Stripped Lower Receiver $155
• Geissele Automatics Super Duty Stripped Lower Receiver $175
• Spike's Tactical Spider Stripped Lower Receiver $107
• Centurion Arms CM4 Forged Stripped Lower Receiver $135
• Palmetto State Armory Sabre-15 Ambi Lower Receiver $100
• Griffin Armament Mk2 Ambidextrous Stripped Lower Receiver $220
• American Defense Manufacturing UIC Ambidextrous Stripped Lower Receiver $370
• Radian Weapons AX556 Ambidextrous Lower Receiver $450
• Aero Precision AR15 Gen 2 Stripped Lower Receiver $120
• Palmetto State Armory AR-15 Stealth Stripped Lower Receiver $80
• LMT Defense MARS-L Ambidextrous Stripped Lower Receiver $392
• Anderson Manufacturing AM-15 Stripped Lower Receiver $90
• KE Arms KP-15 Polymer Stripped Lower Receiver $80
• Seekins Precision SP223 Gen2 Billet Lower $269
• Battle Arms Development BAD556-LW Lightweight Ambi Lower Price varies
• San Tan Tactical STT-15 Billet Lower Receiver $286
• Sharps Bros The Jack Stripped Lower Receiver (SBLR03) $290
• Brownells BRN-16A1 M16A1 Stripped Lower Receiver Price varies
• Cross Machine Tool (CMT) UHP-15 Billet Stripped Lower Receiver $209
• Aero Precision M4E1 Stripped Lower Receiver, FDE Cerakote (Freedom edition) $125

Magazine

• Magpul PMAG 20 AR/M4 GEN M3 $15.95
• Magpul PMAG 30 AR/M4 GEN M3 $15.95
• Magpul PMAG 30 AR 300 B GEN M3 $16.95
• Lancer L5AWM 300 BLK 30-Round Price varies
• DURAMAG SPEED 30-Round Aluminum $12
• Lancer L5AWM 30-Round Magazine $18
• Magpul PMAG 40 AR/M4 GEN M3 $23.95
• Amend2 Mod-3 300 BLK 30-Round Magazine $14
• ASC 6.5 Grendel/6mm ARC 25-Round Magazine $19
• ASC 6.5 Grendel/6mm ARC 10-Round Magazine $16
• DURAMAG Stainless Steel 20-Round 6.5 Grendel Magazine $22
• Alexander Arms 6.5 Grendel 17-Round Magazine (M-EG65-17) Price varies
• DURAMAG 7.62x39 AR-15 28-Round Magazine $22
• DURAMAG 7.62x39 AR-15 20-Round Magazine $19
• ASC 7.62x39 AR-15 30-Round Stainless Magazine $22
• ASC 7.62x39 AR-15 10-Round Magazine Price varies
• ASC .450 Bushmaster 5-Round Magazine $33
• DURAMAG SS .450 Bushmaster 5-Round Magazine $20
• DURAMAG SS .450 Bushmaster 7-Round Magazine Price varies
• American Tactical .450 Bushmaster 5-Round Magazine (ATIM450BM5) $27

Trigger

• Geissele Automatics SSA-E Trigger $245
• LaRue Tactical MBT-2S Trigger $135
• CMC Triggers Single Stage Trigger (drop-in) $157
• Radian Weapons Vertex FBX Trigger $240
• Geissele Automatics Super Semi-Automatic (SSA) $229
• Geissele Automatics Super Dynamic Combat (SD-C) $190
• Geissele Automatics Super Dynamic 3-Gun (SD-3G) $250
• Palmetto State Armory EPT Enhanced Polished Fire Control Group $40
• Rise Armament Rave 140 Curved Trigger $109
• TriggerTech Duty Single-Stage Curved Trigger $140
• Radian Weapons Vertex CBX Trigger $240
• BCM PNT Trigger $66
• ALG Defense ACT Advanced Combat Trigger $83
• ALG Defense QMS Trigger $68
• Wilson Combat Tactical Trigger Unit TTU-M2 $196
• Elftmann Tactical ELF Match Trigger $249
• Timney Triggers Impact AR Trigger $135
• HIPERFIRE Hipertouch 24 Elite (24E) $190
• CMC Triggers Two Stage Flat Trigger $210
• CMC Triggers CCT Curved Drop-in Trigger $190

Grip

• Magpul MOE-K2+ Grip $21.95
• Magpul MOE-K2 Grip $19.85
• Magpul MOE K2-XL Grip $23.70
• Magpul MOE SL Grip $19.99
• BCM Gunfighter Grip Mod 3 $19
• B5 Systems Type 23 P-Grip $19.99
• Reptilia CQG Grip $21
• TangoDown BG-17 Battlegrip $39.92
• Die Free Co Kung Fu Grip $20
• VZ Grips AR15 Operator II Gen 2 G10 Rifle Grip $85
• Magpul MOE+ Grip $25
• Magpul MOE Grip $21
• Magpul MIAD Gen 1.1 Grip Kit $40
• Ergo SureGrip Ambidextrous $15
• Hogue OverMolded Beavertail Grip (Finger Grooves) $25
• Mission First Tactical Engage AR15/M16 Pistol Grip (V2) $17
• BCM Gunfighter Grip Mod 0 $26
• Strike Industries Overmolded Enhanced Pistol Grip 15 Degree $23
• Daniel Defense AR-15 Pistol Grip $30
• VZ Grips AR15 Alien Gen 2 G10 Grip $85

Stock

• Magpul MOE SL-K Carbine Stock (Mil-Spec) $40
• Magpul CTR Carbine Stock (Mil-Spec) $70
• B5 Systems Bravo Collapsible Stock (Mil-Spec) $58
• B5 Systems Enhanced SOPMOD Stock (Mil-Spec) $95
• BCM Gunfighter Stock Mod 0 $56
• Magpul MOE SL Carbine Stock (Mil-Spec) $60
• Magpul MOE SL-S Carbine Stock (Mil-Spec) $85
• Magpul MOE Fixed Carbine Stock $37
• Magpul STR Carbine Stock (Mil-Spec) $78
• Magpul ACS-L Carbine Stock (Mil-Spec) $78
• Mission First Tactical Battlelink Minimalist Stock $50
• Magpul MOE Rifle Stock $75
• Magpul PRS Gen 3 Precision Stock $240
• Magpul PRS Lite Stock $110
• Magpul UBR Gen 2 Collapsible Stock $185
• Law Tactical Folding Stock Adapter (Gen-S) $270
• B5 Systems Fixed Bravo Stock $53
• LMT Defense SOPMOD Buttstock (Mil-Spec) $211
• Luth-AR MBA-1 Modular Buttstock $128
• Magpul DT Carbine Stock (Mil-Spec) $52

Optic or sights

• Aimpoint Micro T-2 $986
• Holosun AEMS Core X2 $300
• SIG Sauer Romeo5 Gen II $129
• Holosun HE510C-GR Elite $340
• Trijicon MRO $479
• EOTech EXPS3 $815
• Vortex AMG UH-1 Gen II $547
• Primary Arms SLx 1x MicroPrism $265
• Primary Arms SLx 3x MicroPrism $350
• Primary Arms SLx 1-6x24 Gen IV $350
• Aimpoint PRO (Patrol Rifle Optic) $512
• Trijicon ACOG TA31 4x32 $1,179
• EOTech HHS II (EXPS2-2 + G33 Magnifier) $1,100
• Aimpoint 3X-C Magnifier (FlipMount/TwistMount) $362
• Vortex Strike Eagle 1-8x24 (AR-BDC3) $349
• SIG Sauer Tango-MSR 1-10x26 FFP $600
• Nightforce ATACR 1-8x24 F1 $2,800
• EOTech Vudu 1-10x28 FFP $1,499
• Magpul MBUS Gen 2 Flip-Up Sight Set $90
• Troy Industries Di-Optic Battlesight Micro Folding Set $168

Light & laser

• SureFire M340DFT-PRO Turbo Mini Scout Light Pro $350
• SureFire M640DFT-PRO Turbo Scout Light Pro $334
• Modlite PLHv2 $279
• Modlite OKW v2 18350 $309
• Cloud Defensive REIN 3.0 $316
• Streamlight ProTac Rail Mount HL-X Pro $140
• Arisaka 300 Series E1HTv2 $180
• Olight Odin GL Mini $160
• Holosun IRIS-GR3 $900
• Steiner DBAL-D2 $1,789
• Arisaka 600 Series (E2HTv3 head) $180
• INFORCE WMLx Gen 3 $150
• Streamlight ProTac Rail Mount 2.0 $179
• SureFire M600DF Scout Light Pro $349
• Cloud Defensive OWL (Optimized Weapon Light) Price varies
• Olight Odin $175
• Streamlight TLR RM 2 Laser-G $330
• SureFire M600V IR Scout Light $499
• Holosun LS321G $849
• Steiner DBAL-A3 $1,725

Foregrip or bipod

• Magpul M-LOK AFG Angled Fore Grip $19
• Magpul MVG MOE M-LOK Vertical Grip $20
• Magpul M-LOK SVG Short Vertical Grip $23
• Magpul M-LOK Hand Stop Kit (MAG608) $22
• BCM Gunfighter KAG Mod 3 (M-LOK) $19
• BCM Gunfighter Vertical Grip Mod 3 (M-LOK) $19
• Arisaka Defense Hand Stop (M-LOK) $30
• Emissary Development Handbrake X M-LOK $35
• TangoDown Stubby Vertical Grip for M-LOK Price varies
• Strike Industries LINK Anchor Handstop (M-LOK/KeyMod) Price varies
• Magpul AFG-2 Angled Fore Grip $32
• Magpul MOE RVG Rail Vertical Grip $22
• Knight's Armament Vertical Forward Pistol Grip (KM-97098) $95
• Die Free Co Tiger Claw (M-LOK) $20
• Magpul XTM Hand Stop Kit (MAG511) $23
• Harris S-BRM 6-9 in Swivel Bipod $102
• Magpul Bipod (M-LOK) $109
• Atlas BT10 V8 Bipod $230
• MDT BackCountry Bipod (Picatinny) $300
• Caldwell XLA Pivot 9-13 in Bipod $49