Optic recommendations are based on budget and application. Either of the red dots you mentioned would be just fine, but they are in different price ranges and offer slightly different features and look. It is really up to you as the end user to purchase what you prefer. Please feel free to email us at techsales@opticsplanet.com if you would like other recommendations as there are hundreds.
If you search through forums or Google Images, there does look to be a few people using this optic on an AK.
The Trijicon MRO 1x25mm 2 MOA Adjustable Green Dot Sight paired with a low mount would not provide a true co-witness with the iron sights on the A300 Partol. You will likely still be able to see your sights within the lower 1/5 of the optic window.
Yes, all models of the Trijicon MRO are compatible with magnifiers.
The Trijicon MRO 1x25mm 2 MOA Adjustable Green Dot Sight mounts are designed to work with picatinny rail. Please email us at techsales@opticsplanet.com so we can get more information to better answer your question.
The Sig Juliet4 Magnifier has 3 spacers and can absolute and lower 1/3 co-witness. I recommend choosing the Trijicon MRO 1x25mm 2 MOA Adjustable Green Dot Sight with the mount at which height you want to mount the sight then use the spacers on the magnifier to correspond to the sight.
The Trijicon MRO 1x25mm 2 MOA Adjustable Green Dot Sight Low Quick Release Mount model might work with a SOCOM 16 CQB. However, I recommend using the Full Co-Witness mount.
Absolute co-witness is when the Trijicon MRO 1x25mm 2 MOA Adjustable Green Dot Sight reticle covers the front iron. Lower 1/3 co-witness is when the front iron sight covers the lower 1/3 of the Trijicon MRO 1x25mm 2 MOA Adjustable Green Dot Sight, sight picture. This is determined by the height at which the Trijicon MRO 1x25mm 2 MOA Adjustable Green Dot Sight is mounted.
There are a few differences between the the Trijicon MRO 1x25mm 2 MOA Adjustable Green Dot Sight and the Trijicon MRO HD 1x25mm Red Dot Sight. First the Trijicon MRO HD 1x25mm Red Dot Sight has been re-engineered and updated to work better with magnifier. The Trijicon MRO HD 1x25mm Red Dot Sight also has the option of changing from a center dot only reticle or a 2 MOA center dot with 68 MOA segmented circle reticle. The Trijicon MRO 1x25mm 2 MOA Adjustable Green Dot Sight has just the center dot reticle but has models that have a green dot or red dot. The Trijicon MRO HD 1x25mm Red Dot Sight models only come with a red reticle.
I would get the Trijicon MRO 1x25mm 2 MOA Adjustable Green Dot Sight with the MRO Low Mount for a Benelli M4.