Gents and Madams,
Most everyone is familiar with the inexpensive and readily available Lyman Series 17A Front Target Sights, available in three different heights, (Lyman p/n's 3171076, 3171078 & 3171080) and the same aftermarket (Lee Shaver) modified models with Spirit Level.
Is anyone out there using the Lyman 20 Globe Front Sight, available in two heights, (Lyman p/n's 3201150 & 3201155)?
The barrel of the Lyman 20 measures .812 OD vs the Lyman 17A which measures .562 in diameter. The Lyman 17A easily fits inside the Lyman 20, for comparison purposes.
Both Lyman Globe Front Sight Models fit 3/8" dovetails.
Seems in low light conditions or maybe in bright light conditions the Lyman 20 may prove more useful than the Lyman 17.
Lastly, yes, the NRA confirms the Lyman 20 is legal for both BPCR Silhouete and Target competition.