"When using the #38 sleeves, the platform is built up in front of the folding sight, and you will go over it with more clearance than anything out there that is only going off the receiver. Your clear to go
especialy if you later get a magnified optic that requires that you go over a fold down sight to get the proper eye relief and lower ht."
No offense but both of these comments make little to no sense at all.
Most backup sights allready fold (exception being LMT chopped A2's and clones)
The SWAN sleeves have a built in rear sight at the same height as without a sleeve, they only create a problem, your optics mount higher and your sight is the same height, = you can't co-whitness with EO-techs #2 reason I sold my #40 (had a SIR #45)
If you are saying mount the rear sight on the SWAN sleeve it is equally stupid:
A: Your front sight will be too short
B: without the SWAN sleeve you would have the same cleareance as you currently have (you have raised the optic mounting platform by the same height as the sight platform)
C: The built up platform screws with clearance (it's just more crap in your field of view), it makes more clearance only if you have a PAQ-4 and have to mount it on top, in which case it gives you the lowest PAQ4 top mounting, providing more clearance than the PAQ4 with it's supplied RAS mount.
SOLUTION: Don't get the #38 and YOU WILL BE BETTER OFF. (you won't need a taller front sight, and you won't have to mount the sight on the SWAN sleeve to get the SAME co-whitness as if you had not gotten the sleeve at all.)
If you are related to ARMS why don't you answer my questions about my Throwlevers on my #19, afterall if it is your product, you should know the answers.