the description says small so that would be .154 diameter
No the Timney Triggers Competition Trigger 75th Anniversary AR-15 will not work in that lower. However, this trigger here should work.
https://www.opticsplanet.com/timney-sig-mpx-curved-shoe-trigger.html
The Timney Triggers Competition Trigger 75th Anniversary is designed for Mil-Spec AR15's, so it might work in an AR10. I recommend using the Timney Triggers AR-10 Competition Trigger located at the link below.
https://www.opticsplanet.com/timney-triggers-ar-10-competition-trigger.html
The Timney Triggers Competition Trigger 75th Anniversary AR-15 Trigger will not work in an IWI X95. The trigger listed at the link below will work for an IWI Tavor X95.
https://www.opticsplanet.com/geissele-super-sabra-trigger-pack-for-iwi-tavor-rifles-05-267.html
Yes, the Timney Triggers Competition Trigger 75th Anniversary will work in a Bushmaster M4.
Yes, the Timney Triggers Competition Trigger 75th Anniversary Trigger will work in a Smith and Wesson AR15.
This Timney Triggers Competition Trigger 75th Anniversary Trigger has a short crisp reset better than majority of factory triggers.