- Mechlabs Nexxus HPA Engine for M4/M16 Airsoft AEG Variants - Black NEX-HPA-ENG-BKSpecial Price $359.99 Regular Price $399.99
- Mechlabs Nexxus HPA Engine for M4/M16 Airsoft AEG Variants - Grey NEX-HPA-ENG-GYSpecial Price $359.99 Regular Price $399.99
- Mechlabs Nexxus HPA Engine for M4/M16 Airsoft AEG Variants - Gold Out of Stock NEX-HPA-ENG-GD$449.99
- Mechlabs Nexxus HPA Engine for M4/M16 Airsoft AEG Variants - Red Out of Stock NEX-HPA-ENG-RD$449.99
- Mechlabs Nexxus HPA Engine for M4/M16 Airsoft AEG Variants - Pink Out of Stock NEX-HPA-ENG-PK$449.99
- Mechlabs Nexxus HPA Engine for M4/M16 Airsoft AEG Variants - Green Out of Stock NEX-HPA-ENG-GN$449.99
- Mechlabs Nexxus HPA Engine for M4/M16 Airsoft AEG Variants - Purple Out of Stock NEX-HPA-ENG-PU$449.99
- Mechlabs Nexxus HPA Engine for M4/M16 Airsoft AEG Variants - Blue Out of Stock NEX-HPA-ENG-BU$449.99