556 NATO 10.3" FSB .070 (Crane Spec)
Crane Spec 556 NATO 10.3" FSB .070

$180.00 $160.00
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10.3 MK18 (Crane Spec)
 
Our 10.3" Crane Spec complete upper receiver features the ideal gas port sizing (.070) to achieve minimal gas blowback when ran suppressed. This unit is specifically designed to be ran in conjunction with a silencer. 
 
We do not guarantee reliable cycling with some manufactures ammunition without the addition of a silencer. 
 
Our MK18 Crane Spec is shipped as pictured, just add your preferred silencer mount, drop in handguard and rear sight (which aligns perfectly with our F marked FSB!

 

- 10.3" 4150 CMV Melonite

- 1/7 Twist

- .070 Gas Port

- M4 Feed Ramps

- Carbine Length Gas System with F-Mark Front Site Base

- QPQ Corrosion Resistant Finish

- 1/2-28 Thread

 

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10.3 MK18 (Crane Spec)
 
Our 10.3" Crane Spec complete upper receiver features the ideal gas port sizing (.070) to achieve minimal gas blowback when ran suppressed. This unit is specifically designed to be ran in conjunction with a silencer. 
 
We do not guarantee reliable cycling with some manufactures ammunition without the addition of a silencer. 
 
Our MK18 Crane Spec is shipped as pictured, just add your preferred silencer mount, drop in handguard and rear sight (which aligns perfectly with our F marked FSB!

 

- 10.3" 4150 CMV Melonite

- 1/7 Twist

- .070 Gas Port

- M4 Feed Ramps

- Carbine Length Gas System with F-Mark Front Site Base

- QPQ Corrosion Resistant Finish

- 1/2-28 Thread