I've owned 3 Lightnings of various generations and iterations. An early, very plain stock .22 springer converted to gas-ram, a later .22 springer with nicer stock, and still own a .177 gas-ram XL SE model with the nicest stock (Minelli?). All were/are plenty accurate piston rifles. The .177 XL SE is the most velocity consistent piston rifle I've tested of several dozen (as shown below). More details as excerpted from the most comprehensive airgun book ever published-
.22 BSA Lightning spring-piston break-barrel, with gas-ram conversion 14.5gr Eley Wasp, 14 shot string- Low= 626, Hi= 648, ES= 22, SD= 6, Avg= 637/13.1
14.3gr Crosman Premier, 10 shot string- Low= 649, Hi= 662, ES= 13, SD= 3, Avg= 655/13.6
.177 BSA Lightning XL spring-piston break-barrel 8.45gr JSB Exact, 20 shot string- Low= 799, Hi= 813, ES= 14, SD= 4, Avg= 806/12.2
.22 BSA Lightning XL spring-piston carbine, lube-tuned, courtesy of Sean Holbeche 15.9gr JSB Exact, 5 shot string- Low= 637, Hi= 644, ES= 7, SD= 3, Avg= 640/14.5
.177 BSA Lightning XL SE spring-piston break-barrel 7.9gr JSB Express, 10 shot string- Low= 887, Hi= 890, ES= 3, SD= 1, Avg= 888/13.8
8.4gr JSB Exact, 10 shot string- Low= 836, Hi= 845, ES= 9, SD= 2, Avg= 840/13.2