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Gun Parts DEMO & Open Box Items — 1,162 products / 1,510 models

One of the best ways to buy your favorite gear at a super low price is with Manufacturer Demo Gun Parts . These Gun Parts are in like-new condition, but because they've been used by either us or the manufacturer as a demonstration unit, sample, or test product the price goes way down! We often open an item for one of our OpticsPlanet YouTube Videos or to test them out to make sure that they are up to our top quality standards. We treat them well and put them back in their original packaging in as near to flawless condition as possible. Though they have been opened up, either we or the manufacturer has checked out and approved them so you'll get the same great performance you'd expect from new Gun Parts. And rest assured because these Manufacturer Demo Gun Parts are covered by the Terms and Conditions of our Return Policy. If you'd like to learn more about all of our Demo Products, check out our Manufacturer Demoed Product Policy Page. There is no question that you like to not spend as much, and we love it when OpticsPlanet is the retailer you turn to when you need the most savings, so make sure to check out our Demo Gun Parts for unreal discounts.image

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1,162 Products in Demo Gun Parts

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Image of Superlative Arms Adjustable Bleed Off Gas Block 2 of 18 models Superlative Arms Adjustable Bleed Off Gas Block (267) List: $99.99 (Save 10%) $89.99 Best Rated
Image of Radian Weapons Glock 43X 9mm RAMJET Barrel w/ AFTERBURNER Compensator 2 of 5 models Radian Weapons Glock 43X 9mm RAMJET Barrel w/ AFTERBURNER Compensator (20) As Low As $389.95 Best Rated
Image of Magpul Industries CTR Rifle Stock, Mil-Spec AR15/M16 1 of 6 models Magpul Industries CTR Rifle Stock, Mil-Spec AR15/M16 (276) List: $64.95 (Save 20%) $51.99 Best Rated
Image of Midwest Industries Benelli M4 M-LOK Handguard made-in-usa-flag 1 of 2 models Midwest Industries Benelli M4 M-LOK Handguard (72) List: $194.95 (Save $11.00) $183.95 Best Rated
Image of Radian Weapons Ramjet-Afterburner Sig Sauer Pistol Compensator 2 of 8 models Radian Weapons Ramjet-Afterburner Sig Sauer Pistol Compensator (40) $409.95 Best Rated
Image of HUXWRX QD Flash Hider 2 of 12 models HUXWRX QD Flash Hider (43) List: $170.00 (Save 19%) $138.00 Blazin' Deal
Image of Radian Weapons SIG P365 XMACRO Backstrap and Magwell made-in-usa-flag 1 of 2 models Radian Weapons SIG P365 XMACRO Backstrap and Magwell (46) List: $192.09 (Save 22%) $149.95 Best Rated
Image of Magpul Industries MBUS 3 Rear Rifle Sight 1 of 7 models Magpul Industries MBUS 3 Rear Rifle Sight (55) List: $59.95 (Save 30%) $41.99 Best Rated
Image of Dead Air Armament Key-Mo 1 of 2 models Dead Air Armament Key-Mo (18) List: $249.00 (Save 20%) $199.00 Best Rated
Image of Magpul Industries MBUS 3 Front Rifle Sight 2 of 8 models Magpul Industries MBUS 3 Front Rifle Sight (62) List: $39.95 (Save 10%) $35.95 Best Rated
Image of Armaspec AR15 Gen4 H2 Stealth Recoil Spring made-in-usa-flag 2 of 3 models Armaspec AR15 Gen4 H2 Stealth Recoil Spring (40) List: $84.99 (Save 10%) $76.49 Best Rated
Image of Bravo Company MFG MK2 Recoil Mitigation System - Mod 1 2 of 5 models Bravo Company MFG MK2 Recoil Mitigation System - Mod 1 (31) List: $160.00 (Save 28%) $115.95 Best Rated
Image of Kaw Valley Precision ASR Muzzle Brake 1 of 12 models Kaw Valley Precision ASR Muzzle Brake (98) List: $59.95 (Save 17%) $49.95 Best Rated
Image of FAB Defense GL CORE MAG CP - M4 Survival Buttstock w/ Built-in Mag Carrier 2 of 8 models FAB Defense GL CORE MAG CP - M4 Survival Buttstock w/ Built-in Mag Carrier (91) As Low As (Save Up to 64%) $50.49 Blazin' Deal
Image of Radian Weapons Glock 19/19X/45 9mm RAMJET Barrel w/ AFTERBURNER Compensator 3 of 5 models Radian Weapons Glock 19/19X/45 9mm RAMJET Barrel w/ AFTERBURNER Compensator (6) As Low As $389.95 Best Rated
Image of Radian Weapons Glock 19 9mm RAMJET Barrel w/ AFTERBURNER Compensator 3 of 10 models Radian Weapons Glock 19 9mm RAMJET Barrel w/ AFTERBURNER Compensator (207) As Low As (Save Up to 28%) $369.99 Best Rated
Image of Rearden MFG Atlas Bravo Heat Treat Suppressor Adapter 1 of 2 models Rearden MFG Atlas Bravo Heat Treat Suppressor Adapter (11) List: $75.00 (Save 10%) $67.50 Best Rated
Image of SureFire Socom Muzzle Brake/Suppressor Adapter 1 of 3 models SureFire Socom Muzzle Brake/Suppressor Adapter (75) List: $169.00 Add to Cart for Your
Special Price Best Rated
Image of XTS Glock G19 Threaded Barrels made-in-usa-flag 1 of 2 models XTS Glock G19 Threaded Barrels (17) List: $109.90 (Save 20%) $87.92 Best Rated
Image of SilencerCo ASR Muzzle Brake 3 of 16 models SilencerCo ASR Muzzle Brake (131) As Low As (Save Up to 26%) $69.99 Best Rated
Image of Magpul Industries PRS Lite Rifle Stock 1 of 4 models Magpul Industries PRS Lite Rifle Stock (96) List: $119.95 (Save $10.00) $109.95 Best Rated
Image of Q Shorty Stock 1 of 3 models Q Shorty Stock (11) $350.00 Best Rated
Image of OpticsPlanet Exclusive Maxim Defense Industries RDB Roller Delayed Blowback System 1 of 3 models OpticsPlanet Exclusive Maxim Defense Industries RDB Roller Delayed Blowback System (47) List: $189.95 (Save 11%) $169.99 Blazin' Deal
Image of SB Tactical AKTF-01-SB AK Tri Side-Fold Brace w/Adapter 1 of 2 models SB Tactical AKTF-01-SB AK Tri Side-Fold Brace w/Adapter (16) List: $199.99 (Save 28%) $143.99 Best Rated
Image of Q Cherry Bomb Muzzle Brake/Suppressor Adapter 9 of 17 models Q Cherry Bomb Muzzle Brake/Suppressor Adapter (23) As Low As (Save Up to 19%) $89.99 Blazin' Deal
Image of HK 51000384 UPPER RECEIVER KIT MR556A4 16.5" 1 of 2 models HK 51000384 UPPER RECEIVER KIT MR556A4 16.5" List: $2,499.00 (Save 13%) $2,179.00 Final Sale
Image of Midwest Industries AK Alpha Series Folding Stock made-in-usa-flag 2 of 5 models Midwest Industries AK Alpha Series Folding Stock (50) As Low As (Save Up to 14%) $249.99 Best Rated
Image of OpticsPlanet Exclusive Daniel Defense Custom Upper Receiver 2 of 4 models OpticsPlanet Exclusive Daniel Defense Custom Upper Receiver (102) List: $1,300.00 (Save 18%) $1,069.00 Blazin' Deal
Image of VKTR Industries 16in VK-1 Complete AR-15 Upper 1 of 4 models VKTR Industries 16in VK-1 Complete AR-15 Upper List: $1,869.99 (Save 30%) $1,316.49 Blazin' Deal
Image of RISE Armament BLITZ Drop-In Trigger w/Anti Walk Pins made-in-usa-flag 1 of 3 models RISE Armament BLITZ Drop-In Trigger w/Anti Walk Pins (34) List: $209.99 (Save 50%) $104.00 Blazin' Deal
Image of Midwest Industries SP Series AR-15 M-LOK Handguard made-in-usa-flag 5 of 11 models Midwest Industries SP Series AR-15 M-LOK Handguard (119) As Low As (Save Up to 15%) $157.95 Best Rated
Image of Q Sugar Weasel Upper 2 of 4 models Q Sugar Weasel Upper (10) As Low As (Save Up to 10%) $1,309.00 Blazin' Deal
Image of Reptilia LINK for CZ Scorpion w/ Magpul Zhukov 1 of 2 models Reptilia LINK for CZ Scorpion w/ Magpul Zhukov (30) List: $209.95 (Save 10%) $188.96 Best Rated
Image of Sylvan Arms SA5 Folding Stock Adaptor 1 of 2 models Sylvan Arms SA5 Folding Stock Adaptor (4) List: $219.99 (Save 14%) $189.99 Final Sale
Image of MDT XRS Chassis System 1 of 14 models MDT XRS Chassis System (23) List: $599.99 (Save $35.50) $564.49 Blazin' Deal
Image of FAB Defense Top Mounted Deployable Front and Rear Set of Flip-up Sights 2 of 5 models FAB Defense Top Mounted Deployable Front and Rear Set of Flip-up Sights (50) As Low As (Save Up to 56%) $41.49 Blazin' Deal
Image of TRYBE Defense AR-15 Magnite Ultra Function Lightweight M-LOK Handguard w/ Cut Top Rail made-in-usa-flag 4 of 12 models TRYBE Defense AR-15 Magnite Ultra Function Lightweight M-LOK Handguard w/ Cut Top Rail (35) As Low As (Save Up to 79%) $30.77 Blazin' Deal
Image of Triggertech Remington 700 Diamond Trigger 1 of 7 models Triggertech Remington 700 Diamond Trigger (58) $334.99 Best Rated
Image of TRYBE Defense AR-15 Magnite Go Fast Ultra Lightweight M-LOK Handguard w/ Full Top Rail made-in-usa-flag 1 of 9 models TRYBE Defense AR-15 Magnite Go Fast Ultra Lightweight M-LOK Handguard w/ Full Top Rail (41) List: $219.99 (Save 64%) $79.28 Blazin' Deal
Image of MDT ESS Chassis System 2 of 4 models MDT ESS Chassis System (3) As Low As (Save Up to 17%) $983.49 Blazin' Deal
Image of Q The FIX AR-15 M-LOK Handguard 3 of 6 models Q The FIX AR-15 M-LOK Handguard (3) As Low As $328.49 Blazin' Deal
Image of Radian Weapons Glock 17 9mm RAMJET Barrel w/ AFTERBURNER Compensator 3 of 6 models Radian Weapons Glock 17 9mm RAMJET Barrel w/ AFTERBURNER Compensator (2) As Low As $389.95 Final Sale
Image of Midwest Industries Gen2 Two-Piece Drop-In Handguard made-in-usa-flag 1 of 4 models Midwest Industries Gen2 Two-Piece Drop-In Handguard (130) List: $183.95 (Save 13%) $159.99 Best Rated
Image of FAB Defense Aluminum Tactical Rail System 4 of 7 models FAB Defense Aluminum Tactical Rail System (1) As Low As (Save Up to 79%) $52.49 Blazin' Deal
Image of Wilson Combat WCP365 XL Grip Module 1 of 4 models Wilson Combat WCP365 XL Grip Module (205) $66.95 Best Rated
Image of Proof Research Defiance Ruckus Carbon Pre-Fit Threaded Barrels 1 of 9 models Proof Research Defiance Ruckus Carbon Pre-Fit Threaded Barrels (1) List: $1,149.00 (Save 13%) $999.00 Final Sale
Image of FAB Defense M4 Folding, Collapsible Buttstock for VZ58 1 of 2 models FAB Defense M4 Folding, Collapsible Buttstock for VZ58 List: $358.70 (Save 54%) $166.49 Blazin' Deal
Image of Proof Research Accuracy International Pre-Fit Carbon Fiber Barrel 1 of 31 models Proof Research Accuracy International Pre-Fit Carbon Fiber Barrel (1) List: $1,399.00 (Save 19%) $1,139.00 15% Coupon
Image of Samson S.A.S. Rifle Stock w/Folding Picatinny Adapter 1 of 3 models Samson S.A.S. Rifle Stock w/Folding Picatinny Adapter (14) List: $315.65 (Save $15.78) $299.87 Best Rated
Image of Midwest Industries AK Alpha Series Railed Top Cover made-in-usa-flag 1 of 4 models Midwest Industries AK Alpha Series Railed Top Cover (16) List: $294.95 (Save 15%) $249.99 Best Rated
Image of Norsso P365 Reptile C Slide 1 of 2 models Norsso P365 Reptile C Slide (2) List: $459.00 (Save $22.95) $436.05 Final Sale
Image of Proof Research Defiance Ruckus Pre-Fit Barrels 1 of 2 models Proof Research Defiance Ruckus Pre-Fit Barrels List: $1,149.00 (Save 22%) $899.99 Final Sale
Image of FAB Defense Recoil Compensating Folding, Collapsible Buttstock System for VZ58 - Polymer Joint 3 of 6 models FAB Defense Recoil Compensating Folding, Collapsible Buttstock System for VZ58 - Polymer Joint (3) As Low As (Save Up to 79%) $47.49 Blazin' Deal
Image of FAB Defense M4 Collapsible Buttstock for SAIGA (Joint) 2 of 4 models FAB Defense M4 Collapsible Buttstock for SAIGA (Joint) As Low As (Save Up to 79%) $42.49 Blazin' Deal
Image of TRYBE Defense AR-15 Magnite Ultra Function Lightweight M-LOK Handguard w/ Full Top Rail made-in-usa-flag 3 of 9 models TRYBE Defense AR-15 Magnite Ultra Function Lightweight M-LOK Handguard w/ Full Top Rail (48) As Low As (Save Up to 71%) $57.59 Blazin' Deal
Image of OpticsPlanet Exclusive Kinetic Development Group FN SCAR Folding Rifle Stock 1 of 3 models OpticsPlanet Exclusive Kinetic Development Group FN SCAR Folding Rifle Stock (3) List: $384.98 (Save $28.87) $356.11 Final Sale
Image of Geissele Mk4 M-Lok Super Modular Rail made-in-usa-flag 1 of 11 models Geissele Mk4 M-Lok Super Modular Rail (12) List: $375.00 (Save $35.01) $339.99 Best Rated
Image of Proof Research Bolt Action Carbon Fiber Blank Barrels 1 of 28 models Proof Research Bolt Action Carbon Fiber Blank Barrels List: $999.00 (Save 33%) $669.99 Clearance
Image of MDT Howa 1500 Oryx Rifle Chassis 3 of 80 models MDT Howa 1500 Oryx Rifle Chassis (124) As Low As (Save Up to 13%) $403.49 Blazin' Deal
Image of Q Mini Fix 5.56 NATO Barrel Assembly 1 of 3 models Q Mini Fix 5.56 NATO Barrel Assembly List: $600.00 (Save 19%) $483.49 Blazin' Deal
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Demo Gun Parts How To Guides View All

OpticsPlanet's Hottest New Products for 2026 by Brett R.
Best AR-15 Handguards of 2026 on OpticsPlanet by OpticsPlanet Product Expert
How to Choose an Aftermarket Pistol Trigger by Ethan L
Why Buy An Aftermarket Glock Slide by Dan T.

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