Cborden,
I've used the ACOG TA01 on a pair of Bushmaster XM15E2S with excellent results. A rear eyepiece (ala the NVDs) is available for the rear lens, from a scientific instrument supply house (listed on card with new ACOG). I use a .45 patch over the objective lens when it is stored upright in the hovel, to prevent dust accumulation on it. If there is a requirement to keep it clean in a dusty field environment, consider using a rubberband and saran wrap or a dry condom. I'm not aware of any Mfgr that makes a front cover for this design ACOG, due to the cone and bias cut of the bell.
For those of you that did not receive the eyepiece and scope cover info with your ACOG, the following is provided to facilitate procurement:
(for rear lens eye piece like night-scopes)
Edmund Scientific Co.
101 East Gloucester Pike
Barrington, NJ 08007-1380
Cust Svc: 609-573-6260
Orders: 609-573-6250/547-3488
FAX : 609-573-6295
PN: E60.100 - Rubber Eye Guard
(for regular Butler Creek scope cap covers)
PN: 19501; size: small; 4x32 & 3.5x35 rear lens
PN: 19503; size: large; 3.5x35 ONLY (N/A 4x32 for reasons above)
[This message has been edited by Mykl (edited May 13, 1999).]