No you do not. It says in the description that it is not necessary.
These Kaw Valley Precision 2.25in Magnum Linear Compensators will not work with an Aero Precision EPC9. However, the model at the link below will work.
https://www.opticsplanet.com/kaw-valley-precision-linear-compensator.html?_iv_code=4S3-BMB-LC1-BLK-LINEAR-9MM-1-2X28TPI&_iv_projectile-caliber=9mm-caliber&_iv_threads-per-inch=1-sl-2x28
Yes, the Kaw Valley Precision 2.25in Magnum Linear Compensator is compatible with your Juggernaut Tactical 5.56 rifle. The correct model is MPN:KVP-MAG-2250.
You will need to select a Kaw Valley Precision Linear Compensator that matches your firearm caliber as well as barrel threading. From what information I could the the CMMG .45ACP barrels are threaded for .578x28. So you would need the Kaw Valley Precision Linear Compensator at the link below.
https://www.opticsplanet.com/kaw-valley-precision-linear-compensator.html?_iv_caliber-193146313=dot-45-caliber&_iv_threads-per-inch=dot-578x28
The Kaw Valley Precision 2.25in Magnum Linear Compensator can be used for a 6.5 Grendel. You will need model number KVP-MAG-2251 and make sure your barrel is threaded 5/8x24 to match the Kaw Valley Precision 2.25in Magnum Linear Compensator for 6.5mm.
The Kaw Valley Precision 2.25in Magnum Linear Compensator can be used for a rifle chambered in 450 Bushmaster as long as your barrel is threaded 11/16x24. The Kaw Valley Precision 2.25in Magnum Linear Compensator model you need is KVP-MAG-2252.
The Kaw Valley Precision 2.25in Magnum Linear Compensator will not work on a CZ Scorpion Evo 3. However, the model listed below should work. Just ensure you select a model that matches the caliber and threads of your gun.
https://www.opticsplanet.com/kaw-valley-precision-linear-compensator.html
Yes, the Kaw Valley Precision 2.25in Magnum Linear Compensator will work on an AR pistol in 300 Blackout. Just ensure the threads of the .30 caliber model match the threads on your barrel.