What is this piece on the front sight post? Does it have a name? What is its purpose?Main-Plankton8732

What is this piece on the front sight post? Does it have a name? What is its purpose?

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[WTS] [WTT] Magpul MBUSSY2 Set Black (looking for an MBUS Pro Front)

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What is this piece on the front sight post? Does it have a name? What is its purpose?

[WTS] [WTT] Magpul MBUSSY2 Set Black (looking for an MBUS Pro Front)

[WTS][WTT] Magpul MBUS2 Set Black for Magpul MBUS Pro Front Sight

[WTB] MBUS Pro Front, Emissary Handbrake FDE

[WTS] Shaeffer Machining MLOK Tape Switch Mount with Cable Control for Streamlight with Constant on Button (Larger size Streamlight switch)

[WTS] BCG, Arisaka Indexer, Streamlight Tape Switch Mlok Mount, Aimpoint QRP2 Mount, Ambi CH, KAK Flash Can, BUIS Set, Magpul Grip and Stock

[WTS] BCG, Arisaka Indexer, Streamlight Tape Switch Mlok Mount, Aimpoint QRP2 Mount, Ambi CH, KAK Flash Can, BUIS Set, Magpul Grip and Stock

[WTB] DFCO Grip Plug, Radian/G$ Takedown Pins, Radian Forward Assist, Radian Bolt Catch, MBUS Pro Front/Rear, Multitasker NANO Tool, Magpul Paraclip and Paraclip QD Adapters

[WTS] Magpul MOE Stock, VISM MLOK Carbine Handguard, Magpul Pic Rail Covers, Alien Gear Photon Taurus Holster+2 Mags, Aimpoint QRP2 Mount, Muzzle Devices, AR and Pistol Accessories, Cheap Optic, Etc

[WTB] DFCO Grip Plugs, Radian Bolt Catch, Radian Forward Assist, MBUS Pro Front, Multitasker NANO Tool, Magpul Paraclip and Paraclip QD Adapters, Strike Industries Billet Ultimate Dust Cover

[WTS] Magpul MOE Stock, MLOK Carbine Handguard, Magpul Pic Rail Covers, Safariland G19/23/45 Duty Holster, Alien Gear Photon Taurus Holster+2 Mags, Aimpoint QRP2 Mount, Muzzle Devices, AR and Pistol Accessories, Cheap Optic, Etc

[WTB] Radian Bolt Catch, DFCO Grip Plugs, Magpul Paraclip/Paraclip QD Adapters, MBUS Pro Front, Strike Industries Billet UDC, Multitasker NANO Tool

[WTS] Parts Bin Clean Out!! Magpul MOE Stock, MLOK Carbine Handguard, Safariland G19/23/45 Duty Holster, Alien Gear Photon Taurus Holster+2 Mags, Aimpoint QRP2 Mount, Muzzle Devices, AR and Pistol Accessories, Cheap Optic, and more!!

[WTS] PARTS CLEAN OUT!!! Magpul MOE Stock, KAK Shockwave Brace, MLOK Carbine Handguard, Safariland G19/23/45 Duty Holster, Alien Gear Photon Taurus Holster+2 Mags, Aimpoint QRP2 Mount, BCM KAG, Muzzle Devices, AR and Pistol Accessories, Cheap Optic, CCW Belt, and more!!

[WTT] ADM QD Aimpoint PRO/M68 Mount in FDE for Arisaka Handstop and Arisaka Offset Scount Mount

[WTS] G$ Super Charging Handle Black

[WTT] Day Four! Save this beautiful mount from the rattle can!! FDE ADM 30MM Single Ring QD Mount for Aimpoint PRO/M68/COMP M2 Absolute CoWitness Height for the same in Black

[WTT] Day Three!! Help a brother out! FDE ADM 30MM Single Ring QD Mount for Aimpoint PRO/M68/COMP M2 Absolute CoWitness Height for the same in Black

First AR Build! How did I do? What would you change/do differently?

[WTT] FDE ADM 30MM Single Ring QD Mount for Aimpoint PRO/M68/COMP M2 Absolute CoWitness Height for the same in Black

[WTT] FDE ADM 30MM Single Ring QD Mount for Aimpoint PRO/M68/COMP M2 Absolute CoWitness Height for the same in Black

[WTT] FDE ADM 30MM Single Ring QD Mount for Aimpoint PRO/M68/COMP M2 Absolute CoWitness Height for the same in Black

[WTB] Radian Bolt Catch, FDE Ejection Port Cover, B5 Grip Plug Black, Multitasker NANO Tool

[WTB] Radian Talon and/or Talon Parts, Radian Bolt Catch, FDE Magpul/Strike EPC, Mlok Rail Covers, Romeo 5 Parts, Streamlight Tape Switch Mlok Mount (Shafer/Cloud etc)

[WTB] Sig Romeo 5 Mount Cross Bolt and Keeper (or OEM High Mount) and Bikini Style OEM Lens Cover