• Grey Ghost Precision 7075-T651 biller upper receiver with M4 feed ramps
• Extended length (14") KeyMod or M-LOK hand guard
• True Black Type III Mil Spec hard coat anodize
• Mega Arms 16” .300 Blackout 1x8 twist BBL. 11 degree target crown, ½-28 threaded muzzle with Lantac dragon muzzle brake, Black Nitride coating in and out, Mid length gas system
• Black Nitride MPI tested Mil Spec BCG
• Grey Ghost Precision 7075-T651 billet ambi lower receiver
• Mega Arms single stage trigger, 4 ½ pound pull and Slide Lock charging handle
• Battle Arms Development BAD-CASS safety selector
• MAGPUL pistol grip and ACS-L Stock
• Made in the USA

• Grey Ghost Precision 7075-T651 billet upper receiver
• Extended length (14") KeyMod hand guard
• True Black Type III Mil Spec hard coat anodize
• Mega Arms 16" .308WIN match grade BBL. 1x10 twist, 11 degree target crown, 5/8-24 threaded muzzle with Lantac dragon muzzle brake, Black Nitride coating in and out, Mid Length gas.
• Phosphate MPI tested .308 BCG
• Carbine .308 buffer set
• Grey Ghost Precision 7075-T651 billet ambi lower receiver
• Mega Arms single stage trigger, 4 1/2 pound pull
• Battle Arms Development BAD-CASS safety selector
• MAGPUL pistol grip and ACS-L Stock
• Scope not included
• Made in the USA

Now featuring an adjustable gas block. It comes all the way open, and has 30 points of adjustment. We suggest starting at 15 for suppressed shooting.

Specs on the adjustable gas block

• The pressure used in the block is reduced only to the amount required to drive the bolt carrier. The remaining gas / pressure are bled out of the block allowing the system to run much cleaner and cooler
• Reduction of felt recoil
• Patent pending adjustment detente is located outside of the block and therefore no contamination
• The gas adjustment screw does not restrict the gas flow; therefore there is no erosion or seizing of the screw / no loss of detent due to carbon build up. Although it is removable, we have added a safety mechanism, which stops you from unintentionally backing the screw all the way out
• When using SBR’s and / or suppressors the bleed off port allows the excessive pressure to be exhausted out of the block reducing blow back

• Grey Ghost Precision 7075-T651 biller upper receiver with M4 feed ramps
• Extended length (14") KeyMod or M-LOK hand guard
• True Black Type III Mil Spec hard coat anodize
• Mega Arms 16" 5.56 1x8 twist BBL. 11 degree target crown, 1/2-28 threaded muzzle, Black Nitride coating in and out, Mid Length gas.
• Black Nitride MPI tested Mil Spec BCG
• Grey Ghost Precision 7075-T651 billet ambi lower receiver
• Mega Arms single stage trigger, 4 1/2 pound pull
• Battle Arms Development BAD-CASS safety selector
• MAGPUL pistol grip and ACS-L Stock
• Scope not included
• Made in the USA

Cornerstone; “the chief foundation on which something is constructed or developed” When you want to start your AR build, the lower is the starting point. We have worked closely with our partners at Mega Arms to bring this lower to the market. The fit and finish of our cornerstone will prove to you that you have the right beginning to a reliable and strong AR build. When coupled with our Grey Ghost Precision uppers, the match is very hard to beat.

Characteristics:

• Machined to tighter than Mil-Spec tolerance, the critical tooling dimensions are held to within + - .001
• Machined from forged 7075-T6 Aluminum
• Black Hard anodized with a surface hardness of 60 Rockwell
• Features a nylon tipped tensioning screw to ensure the solid fit between upper and lower maintains for years to come.
• Functions with nearly all available AR parts kits and uppers.
• Flared mag well
• Pictogram safe and fire indicators
• Chevrons on the front of the mag well and the distinctive Grey Ghost markings tie the Cornerstone to the Specter Series of Rifles from Grey Ghost Precision.

NFA DISCLAIMER

Once this part is assembled into a complete firearm, it becomes a regulated item by the National Firearms Act (NFA). Please check with your local and state municipalities for any further regulatory requirements. It is the buyer’s responsibility to make sure they comply with all NFA rules and applicable laws. ALL NFA RULES APPLY

10.5 Complete 5.56 GGP upper

• Grey Ghost Precision 7075-T651 biller upper receiver with M4 feed ramps
• Mid length (8.75") KeyMod or M-LOK hand guard
• True Black Type III Mil Spec hard coat anodize
• Mega Arms 10.5" 5.56 1x8 twist BBL. 11 degree target crown, 1/2-28 threaded muzzle, Black Nitride coating in and out, Pistol length gas.
• Black Nitride MPI tested Mil Spec BCG

Also available in 14.5

NFA DISCLAIMER

Once this part is assembled into a complete firearm, it becomes a regulated item by the National Firearms Act (NFA). Please check with your local and state municipalities for any further regulatory requirements. It is the buyer’s responsibility to make sure they comply with all NFA rules and applicable laws. ALL NFA RULES APPLY

• Grey Ghost Precision 7075-T651 biller upper receiver with M4 feed ramps
• Extended length (14") KeyMod or M-LOK hand guard
• True Black Type III Mil Spec hard coat anodize
• Mega Arms 16” .300 Blackout 1x8 twist BBL. 11 degree target crown,5/8-24 threaded muzzle with Lantac dragon muzzle brake, Black Nitride coating in and out, Pistol length gas system
• Black Nitride MPI tested Mil Spec BCG

Also available in 10.5

NFA DISCLAIMER

Once this part is assembled into a complete firearm, it becomes a regulated item by the National Firearms Act (NFA). Please check with your local and state municipalities for any further regulatory requirements. It is the buyer’s responsibility to make sure they comply with all NFA rules and applicable laws. ALL NFA RULES APPLY

• Grey Ghost Precision 7075-T651 biller upper receiver with M4 feed ramps
• Extended length (8.75") KeyMod or M-LOK hand guard
• True Black Type III Mil Spec hard coat anodize
• Mega Arms 10.5” .300 Blackout 1x8 twist BBL. 11 degree target crown, 5/8-24 threaded muzzle with Lantac dragon muzzle brake, Black Nitride coating in and out, Pistol length gas system
• Black Nitride MPI tested Mil Spec BCG

Also available in 16