The Strike Industries AR Optimus Weight Recoil Buffer POM weights are Thermoplastic weights. Strike Industries does not state the weight of the individual weights and I recommend contacting Strike Industries for that information.
You can use the Strike Industries AR Optimus Weight Recoil Buffer but, Geissele does say a standard buffer can cause damage to the rifle or receiver. However, this is not a standard buffer and you can increase or decrease weight at will.
Yes, the Strike Industries AR Optimus Weight Recoil Buffer is intended for use in carbine length receiver extensions/buffer tubes with a carbine length spring.
Yes, the Strike Industries AR Optimus Weight Recoil Buffer can be used with the CMMG Banshee AR in .45ACP. CMMG uses a standard H buffer in that AR Pistol, so the weight of the Strike Industries AR Optimus Weight Recoil Buffer can be adjusted for best performance in that platform.
This is 83.15mm including the buffer pad.
Yes, it would be compatible with that setup.
No, this does not come with a spring.
Yes, it will.
The weights can be adjusted up to 5.3oz or that of the H3 buffer.
No it will not work for the SI PDW stock... this is designed for carbine tubes... also will not work properly for rifle length buffer tubes.