CptCurl
SWCA Member
A follow-up to my last post.
Here's a photo of my assembled 1921 upper.
Here's a photo of my 1921 upper disassembled. Those parts circled in red are the ones that were modified in the 1928 conversion.
Here's a photo of what appears to be an original converted 1928 actuator (not mine). Notice the extra steel and rivets. All actuators made later were made in one piece. Only converted Colt actuators are riveted like this.
And here's a diagram of 1928 parts that are substituted in the conversion:
I would attach a photo of mine assembled in 1928 configuration and the 1928 parts, but I don't have time this morning to pull it out, make the switch, and take a photo.
A final comment. I much prefer firing mine in original 1921 configuration than in 1928 configuration. The faster firing rate makes it much smoother and easier to keep on target. The slower 1928 firing rate makes it feel choppy and jerky in comparison. John Thompson got it right in the 1928 configuration. It is an awesome weapon.
Curl
Here's a photo of my assembled 1921 upper.

Here's a photo of my 1921 upper disassembled. Those parts circled in red are the ones that were modified in the 1928 conversion.

Here's a photo of what appears to be an original converted 1928 actuator (not mine). Notice the extra steel and rivets. All actuators made later were made in one piece. Only converted Colt actuators are riveted like this.

And here's a diagram of 1928 parts that are substituted in the conversion:

I would attach a photo of mine assembled in 1928 configuration and the 1928 parts, but I don't have time this morning to pull it out, make the switch, and take a photo.
A final comment. I much prefer firing mine in original 1921 configuration than in 1928 configuration. The faster firing rate makes it much smoother and easier to keep on target. The slower 1928 firing rate makes it feel choppy and jerky in comparison. John Thompson got it right in the 1928 configuration. It is an awesome weapon.
Curl
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