Uploaded January 2026 | Updated September 2026, 1 week ago
In this video, Caleb breaks down the LAW Tactical Gen S Sidefolder for the AR-15 and walks through a full swap from a Gen 3M folding adapter to the new Gen S. You will see the profile and material differences, what changed in the latch housing, how the new flange design adds contact area, and how to install and tension the system correctly.
This is a true bench install. Caleb uses the LAW lower alignment tool with a Geissele reaction block to keep the receiver extension perfectly aligned while torquing and staking the castle nut. Along the way, he covers the correct order of operations, what not to overtighten, where thread treatment belongs, and why pulling the system forward and keeping tension correct matters for long-term reliability.
Chapters
00:09 What the LAW Tactical Gen S Sidefolder is
00:24 Folding adapter purpose and quick overview
00:43 Gen S replaces Gen 3M and what changed
01:01 Profile comparison and material differences
01:29 Weight reduction and durability upgrades
01:50 What this video covers (full install and swap)
02:13 Tools used and lower alignment tool overview
02:39 Safety check and rifle disassembly prep
02:47 Remove bolt plug and separate upper and lower
03:27 Remove buffer and spring (A5 length BCM Mark II)
03:59 Remove stock to access the receiver extension
04:14 Why remove the grip for the alignment tool
05:09 Install the LAW lower alignment tool
05:37 Pairing the tool with a Geissele reaction block
06:33 Breaking the stake and removing the castle nut
07:29 Remove receiver extension and capture detents
08:04 Switch to a vise block for the folder removal
08:35 Back off the flange tension screw first
09:26 Use the LAW armorer tool to remove the flange
10:21 Remove the internal parts and unthread the unit
11:29 Gen S vs Gen 3M side-by-side comparison
12:29 Latch housing changes and reduced bulk
13:56 Start of Gen S installation
14:20 Remove door, spring, and lock assembly
15:08 New flange design comparison and why it matters
16:05 NSN note and compatibility context
16:45 Install and snug the new flange (5 to 7 ft-lb)
17:52 Snug the flange tension screw (do not overtighten)
18:29 Where thread treatment can be used (and where not)
19:04 Reinstall lock assembly, spring, and door indexing
20:40 Reinstall receiver extension and set buffer retainer
21:00 Use the alignment tool to square the extension
22:48 Torque and stake the castle nut at the new index point
23:23 Staking tool and technique tips
25:35 Remove tools and reassemble the lower
26:23 Reinstall grip, buffer, spring, and stock
26:58 Rejoin upper and lower and reinstall bolt plug
27:26 Final check and summary of Gen S benefits
Tools and parts mentioned
LAW Tactical Gen S Sidefolder
LAW Tactical Gen 3M (removed)
LAW lower alignment tool
Geissele reaction block
Midwest Industries armorer wrench
LAW armorer tool (flange tool)
Vise block
Forward Controls Design castle nut
Sons of Liberty Gun Works staking tool (40 degree)
BCM Mark II buffer (A5 length)
B5 stock (shown)
Kung Fu grip (removed and reinstalled)
Thread treatment supplied with the kit (vibration-resistant)
In this video, Caleb breaks down the LAW Tactical Gen S Sidefolder for the AR-15 and walks through a full swap from a Gen 3M folding adapter to the new Gen S. You will see the profile and material differences, what changed in the latch housing, how the new flange design adds contact area, and how to install and tension the system correctly.
This is a true bench install. Caleb uses the LAW lower alignment tool with a Geissele reaction block to keep the receiver extension perfectly aligned while torquing and staking the castle nut. Along the way, he covers the correct order of operations, what not to overtighten, where thread treatment belongs, and why pulling the system forward and keeping tension correct matters for long-term reliability.
Chapters
00:09 What the LAW Tactical Gen S Sidefolder is
00:24 Folding adapter purpose and quick overview
00:43 Gen S replaces Gen 3M and what changed
01:01 Profile comparison and material differences
01:29 Weight reduction and durability upgrades
01:50 What this video covers (full install and swap)
02:13 Tools used and lower alignment tool overview
02:39 Safety check and rifle disassembly prep
02:47 Remove bolt plug and separate upper and lower
03:27 Remove buffer and spring (A5 length BCM Mark II)
03:59 Remove stock to access the receiver extension
04:14 Why remove the grip for the alignment tool
05:09 Install the LAW lower alignment tool
05:37 Pairing the tool with a Geissele reaction block
06:33 Breaking the stake and removing the castle nut
07:29 Remove receiver extension and capture detents
08:04 Switch to a vise block for the folder removal
08:35 Back off the flange tension screw first
09:26 Use the LAW armorer tool to remove the flange
10:21 Remove the internal parts and unthread the unit
11:29 Gen S vs Gen 3M side-by-side comparison
12:29 Latch housing changes and reduced bulk
13:56 Start of Gen S installation
14:20 Remove door, spring, and lock assembly
15:08 New flange design comparison and why it matters
16:05 NSN note and compatibility context
16:45 Install and snug the new flange (5 to 7 ft-lb)
17:52 Snug the flange tension screw (do not overtighten)
18:29 Where thread treatment can be used (and where not)
19:04 Reinstall lock assembly, spring, and door indexing
20:40 Reinstall receiver extension and set buffer retainer
21:00 Use the alignment tool to square the extension
22:48 Torque and stake the castle nut at the new index point
23:23 Staking tool and technique tips
25:35 Remove tools and reassemble the lower
26:23 Reinstall grip, buffer, spring, and stock
26:58 Rejoin upper and lower and reinstall bolt plug
27:26 Final check and summary of Gen S benefits
Tools and parts mentioned
LAW Tactical Gen S Sidefolder
LAW Tactical Gen 3M (removed)
LAW lower alignment tool
Geissele reaction block
Midwest Industries armorer wrench
LAW armorer tool (flange tool)
Vise block
Forward Controls Design castle nut
Sons of Liberty Gun Works staking tool (40 degree)
BCM Mark II buffer (A5 length)
B5 stock (shown)
Kung Fu grip (removed and reinstalled)
Thread treatment supplied with the kit (vibration-resistant)
