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Geissele 16” 5.56 Heavy Barrel

Jsp556

Private
Full Member
Minuteman
Feb 27, 2017
1,270
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I’m no Geissele fan boy but I’m impressed. So after @Bigjake83 posted about his success with the 14.5” Heavy Geissele barrels I reluctantly took a chance one one of the 16” barrels.

The build consisted of the following:
Aero Enhanced upper and 15” hand guard
Expo Arms BCG
Basic Aero Low profile Melonited gas block
Supplied Geissele gas tube
Factory LMT defender 2000 lower
Geissele SSA-E trigger
Magpul STR stock
Subrevtec STR bag rider
1.5” ADM QD mount
Old Bushnell Elite Tactical 3-12
Surefire 4 prong flash hider/mount


I got it together and took it out for function testing with and without a suppressor and it ran 100% using AAC 77gr OTM ammo. The extended gas length gives a smooth recoil impulse. It shot tiny groups but I didn’t get too excited. I didn’t even bother to measure them.

A few weeks passed and I figured I’d put it on paper for record. All groups shot at 100 yards. Same lot of AAC 77gr OTM. All suppressed through a Surefire 7.62 Socom Mini. 3:00 ejection pattern if that matters to you. Four 5 round groups and 1 ten round group. These were shot back to back with no cool down between groups.

IMG_5019.jpeg

Rifle 👆🏻 and target (Potato Pic)

Groups measured using BallisticX app
Ballistic-X-Export-2025-07-04 21:25:26.362704.jpg



Ballistic-X-Export-2025-07-04 21:23:19.458168.jpg
Ballistic-X-Export-2025-07-04 21:21:47.226014.jpg
IMG_7144.jpeg
IMG_7140.jpeg


Y’all check my math but that should figure up to .7128 MOA across the 5 groups.

Not bad for a cheapish build shooting $9.99 a box ammo. I’ll see how it does at range with better ammo when I get the chance.

Happy Independence Day you ungrateful colonials.
 
Is this extended length gas system something between mid and rifle length? I see the gas system being described as "Geissele Length?" Seems like you have a nice shooting carbine.